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Basic Java MCQ

1. A(n) ________ is used as an index to pinpoint a specific element within an array.

Subscript

Element

Argument

Boolean ..

Answer

Correct Answer: Subscript

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2. A(n) ____ causes a value to be sent from a called method back to the calling method.

Return statement.

Primary

Main

Formal

Abstraction

Answer

Correct Answer: Return statement.

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3. A ____ consists of written steps in diagram form, as a series of shapes connected by arrows.

Single equal sign

Curly braces

Sequence

Flowchart

Answer

Correct Answer: Flowchart

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4. If you want all objects to share a single nonchanging value, then the field is static and ______.

Masks

Final

Block

None of these

Answer

Correct Answer: Final

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5. The value of the responsetext property is almost always a(n) ____ string.

XML

XHTML

JSON

HTML

Answer

Correct Answer: JSON

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6. You use a unary minus sign preceding a value to make the value ____.

Negative

Positive

Valid

Constant

Answer

Correct Answer: Negative

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7. Methods used with object instantiations are called ____ methods.

Accessor.

Internal.

Static.

Instance

Answer

Correct Answer: Instance

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8. A(n) ____ variable is known only within the boundaries of the method.

Double

Method

Instance

Local

Answer

Correct Answer: Local

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9. A(n) ____ loop is one that performs no actions other than looping.

Nested

Do-nothing.

Indefinite

Posttest

Answer

Correct Answer: Do-nothing.

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10. A declaration for an enumerated type begins with the ________ key word.

Enumerated.

Enum_type.

Enum.

ENUM

Answer

Correct Answer: Enum.

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11. A decision symbol in an activity diagram takes the shape of a ________.

Diamond.

Rectangle.

Circle.

Triangle.

Answer

Correct Answer: Diamond.

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12. If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ________.

Answer

Correct Answer: 3.

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13. ""aba"".comparetoignorecase(""abc"") returns ________.

-1

-2

Answer

Correct Answer: -2

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14. Assigning ____ to a field means that no other classes can access the field?s values.

Protected access

Private access

User rights

Key access

Answer

Correct Answer: Private access

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15. For ease in locating class methods, many programmers store them in ____ order.

Chronological

Type.

Alphabetical

Numeric

Answer

Correct Answer: Alphabetical

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16. By convention, a class diagram contains the ____ following each attribute or method.

Class

Data type

Argument

Data field.

Answer

Correct Answer: Data type

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17. A(n) ____ method is a method that creates and initializes class objects.

Goes out of scope

Actual parameters

Constructor

Return statement

Comes into scope

Answer

Correct Answer: Constructor

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18. Class ________ represents an image that can be displayed on a jlabel.

Image.

Icon.

ImageIcon.

IconImage

Answer

Correct Answer: ImageIcon.

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19. A logical structure called a(n) ____ structure is when one step follows another unconditionally.

Decision

Straight

Sequence

Unconditional

Answer

Correct Answer: Sequence

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20. When you are working with a ________, you are using a storage location that holds a piece of data.

Numeric literal

Primitive variable

Binary number

Reference variable

Answer

Correct Answer: Primitive variable

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21. When an expression containing a ____ is part of an if statement, the assignment is illegal.

Parentheses

Single equal sign

Boolean expression

None of these

Answer

Correct Answer: Single equal sign

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22. When a parameter is a(n) ______ data type, any changes made in a method are preserved.

String

Binary

Actual

Class

Primitive

Answer

Correct Answer: Class

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23. To prevent a class from being instantiated, ________.

Use the private modifier on the constructor.

The reference of the object

Both

None of these

Answer

Correct Answer: Use the private modifier on the constructor.

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24. To guarantee that the member variables of a class are initialized, you use ____.

Accessors

Mutators

Constructors

Destructor

Answer

Correct Answer: Constructors

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25. The term ________ typically refers to the device that displays console output.

Standard output device

Central processing unit

Secondary storage device

Liquid crystal display

Answer

Correct Answer: Standard output device

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26. The name of the ____ is always the same as the name of the class whose objects it constructs.

Ariable

Constructor

Argument

Method

Answer

Correct Answer: Constructor

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27. The iterator() method is defined in the ________ interface.

Iterator

Collection

Iterable

ArrayList

Answer

Correct Answer: Iterable

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28. The conditional operator ?: takes ____ arguments.

Two

Four

Three

Five

Answer

Correct Answer: Three

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29. The capability to inherit from more than one class is called ____.

Multiple inheritance

Collision

Polyinheritance

Dynamic method binding

Answer

Correct Answer: Multiple inheritance

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30. Java and c++ are _____ languages.

Assembly

High-level

Machine

Second-generation computer

Answer

Correct Answer: High-level

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31. If a compiler detects a violation of language rules, it refuses to translate the class to ____.

An application

A logic error

Machine code

Java

Answer

Correct Answer: Machine code

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32. Fill in the code in comparable________ c = new date();

All of these

Answer

Correct Answer:

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33. A sentinel value ________ and signals that there are no more values to be entered.

Guards the list

Indicates the start of a list

Is a different data type than the values being processed

Is a special value that cannot be mistaken as a member of the list

Answer

Correct Answer: Is a special value that cannot be mistaken as a member of the list

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34. A method that is associated with an individual object is called ________.

A static method

A class method

An instance method

An object method

Answer

Correct Answer: An instance method

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35. You use a ____ following the closing brace of an array initialization list.

;

Answer

Correct Answer: ;

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36. Whenever a method requires multiple arguments, the arguments are always separated with ____.

Forward slashes

Periods

Commas

Brackets

Answer

Correct Answer: Commas

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37. When you use the && operator, you must include a complete _____ on each side.

Boolean expression

Algebric Expression

Conditional opertator

None of these

Answer

Correct Answer: Boolean expression

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38. When working with logical operators, you can always use ____ to change precedence.

Conditional operators

Break statements

Parentheses

Answer

Correct Answer: Parentheses

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39. The characters ____ move the cursor to the next line when used within a println() statement.

Answer

Correct Answer: \n

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40. Method names that begin with ____ and set are very typical.

Block

Get

New

Class

Answer

Correct Answer: Get

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41. Method calls cannot be distinguished by ________.

Method name.

Return type

Parameter lists

Method signature.

Answer

Correct Answer: Return type

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42. An if statement that appears inside another if statement is referred to as __________.

Nested if statement

Tiered if statement

Dislodged if statement

Structured if statement

Answer

Correct Answer: Nested if statement

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43. A(n) ____ comparison is based on the integer Unicode values of the characters.

Integer

Symbol

Lexicographical

Character

Answer

Correct Answer: Lexicographical

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44. From which class do all other classes implicitly extend?

Object

Main

Java

Class

Answer

Correct Answer: Object

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45. What keyword is added to a method declaration to ensure that two threads do not simultaneously execute it on the same object instance?

Native

Volatile

Synchronized

Lock

Answer

Correct Answer: Synchronized

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46. An _ is a serious issue thrown by the JVM that the JVM is unlikely to recover from. An _ is an unexpected event that an application may be able to deal with in order to continue execution.

Exception,assertion

AbnormalException, AccidentalException

Error, exception

Exception, error

Answer

Correct Answer: Error, exception

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47. Which code checks whether the characters in two Strings,named time and money, are the same?

If(time <> money){}

If(time.equals(money)){}

If(time == money){}

If(time = money){}

Answer

Correct Answer: If(time.equals(money)){}

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48. What language feature allows types to be parameters on classes, interfaces, and methods in order to reuse the same code for different data types?

Regular Expressions

Reflection

Generics

Concurrency

Answer

Correct Answer: Generics

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49. Which statement about constructors is not ture?

A class can have multiple constructors with a different parameter list.

You can call another constructor with this or super.

A constructor does not define a return value.

Every class must explicitly define a constructor without parameters.

Answer

Correct Answer: Every class must explicitly define a constructor without parameters.

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50. Which choice is the best data type for working with money in Java?

Float

String

Double

BigDecimal

Answer

Correct Answer: BigDecimal

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51. Which language feature ensures that objects implementing the AutoCloseable interface are closed when it completes?

Try-catch-finally

Try-finally-close

Try-with-resources

Try-catch-close

Answer

Correct Answer: Try-with-resources

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52. Which class does not implement the java.util.Collection interface?

Java.util.Vector

Java.util.ArrayList

Java.util.HashSet

Java.util.HashMap

Answer

Correct Answer: Java.util.HashMap

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53. Which class acts as root class for Java Exception hierarchy?

Clonable

Throwable

Object

Serializable

Answer

Correct Answer: Throwable

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54. What will this code print, assuming it is inside the main method of a class?System.out.println("hello my friends".split(" ")[0]);

Hellomyfriends

Hello

Friends

Answer

Correct Answer: Hello

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55. Which code snippet is valid?

ArrayList words = new ArrayList(){"Hello", "World"};

ArrayList words = Arrays.asList("Hello", "World");

ArrayList words = {"Hello", "World"};

ArrayList words = new ArrayList<>(Arrays.asList("Hello", "World"));

Answer

Correct Answer: ArrayList words = new ArrayList<>(Arrays.asList("Hello", "World"));

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56. In Java, what is the scope of a method's argument or parameter?

Inside the method

Both inside and outside the method

Neither inside nor outside the method

Outside the method

Answer

Correct Answer: Inside the method

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57. What phrase indicates that a function receives a copy of each argument passed to it rather than a reference to the objects themselves?

Pass by reference

Pass by occurrence

Pass by value

API call

Answer

Correct Answer: Pass by value

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58. When should you use a static method?

When your method is related to the object's characteristics

When you want your method to be available independently of class instances

When your method uses an object's instance variable

When your method is dependent on the specific instance that calls it

Answer

Correct Answer: When you want your method to be available independently of class instances

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59. Which operator is used to concatenate Strings in Java

Answer

Correct Answer: +

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60. How would you convert a String to an Int?

"21".intValue()

String.toInt("21")

Integer.parseInt("21")

String.valueOf("21")

Answer

Correct Answer: Integer.parseInt("21")

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61. What type of variable can be assigned to only once?

Private

Non-static

Final

Static

Answer

Correct Answer: Final

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62. Which access modifier makes variables and methods visible only in the class where they are declared?

Public

Protected

Nonmodifier

Private

Answer

Correct Answer: Private

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63. Which is not a valid lambda expression?

A -> false;

(a) -> false;

String a -> false;

(String a) -> false;

Answer

Correct Answer: String a -> false;

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64. Using Java's Reflection API, you can use _ to get the name of a class and _ to retrieve an array of its methods.

This.getClass().getSimpleName(); this.getClass().getDeclaredMethods()

This.getName(); this.getMethods()

Reflection.getName(this); Reflection.getMethods(this)

Reflection.getClass(this).getName(); Reflection.getClass(this).getMethods()

Answer

Correct Answer: This.getClass().getSimpleName(); this.getClass().getDeclaredMethods()

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65. Java programmers commonly use design patterns. Some examples are the _, which helps create instances of a class, the _, which ensures that only one instance of a class can be created; and the _, which allows for a group of algorithms to be interchangeable.

Static factory method; singleton; strategy pattern

Strategy pattern; static factory method; singleton

Creation pattern; singleton; prototype pattern

Singleton; strategy pattern; static factory method

Answer

Correct Answer: Static factory method; singleton; strategy pattern

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66. How do you force an object to be garbage collected?

Set object to null and call Runtime.gc()

Set object to null and call System.gc()

Set object to null and call Runtime.getRuntime().runFinalization()

There is no way to force an object to be garbage collected

Answer

Correct Answer: Set object to null and call System.gc()

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67. What kind of relationship does "extends" denote?

Uses-a

Is-a

Has-a

Was-a

Answer

Correct Answer: Is-a

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68. What is a valid use of the hashCode() method?

Encrypting user passwords

Deciding if two instances of a class are equal

Enabling HashMap to find matches faster

Moving objects from a List to a HashMap

Answer

Correct Answer: Deciding if two instances of a class are equal

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69. Which functional interfaces does Java provide to serve as data types for lambda expressions?

Observer, Observable

Collector, Builder

Filter, Map, Reduce

Consumer, Predicate, Supplier

Answer

Correct Answer: Consumer, Predicate, Supplier

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70. Declare and initialize an array of 10 ints.

Array numbers = new Array(10);

Array[int] numbers = new Array[int](10);

Int[] numbers = new int[10];

Int numbers[] = int[10];

Answer

Correct Answer: Int[] numbers = new int[10];

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71. Which choice is a disadvantage of inheritance?

Overridden methods of the parent class cannot be reused.

Responsibilities are not evenly distributed between parent and child classes.

Classes related by inheritance are tightly coupled to each other.

The internal state of the parent class is accessible to its children.

Answer

Correct Answer: Classes related by inheritance are tightly coupled to each other.

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72. Which operator would you use to find the remainder after division?

DIV

Answer

Correct Answer: %

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73. What language construct serves as a blueprint containing an object's properties and functionality?

Constructor

Instance

Class

Method

Answer

Correct Answer: Class

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74. Declare a variable that holds the first four digits of Π

Int pi = 3.141;

Decimal pi = 3.141;

Double pi = 3.141;

Float pi = 3.141;

Answer

Correct Answer: Double pi = 3.141;

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75. Why are ArrayLists better than arrays?

You don't have to decide the size of an ArrayList when you first make it.

You can put more items into an ArrayList than into an array.

ArrayLists can hold more kinds of objects than arrays.

You don't have to decide the type of an ArrayList when you first make it.

Answer

Correct Answer: You don't have to decide the size of an ArrayList when you first make it.

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76. Which keyword lets you use an interface?

Extends

Implements

Inherits

Import

Answer

Correct Answer: Implements

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77. Normally, to access a static member of a class such as Math.PI, you would need to specify the class "Math". What would be the best way to allow you to use simply "PI" in your code?

Add a static import.

Declare local copies of the constant in your code.

This cannot be done. You must always qualify references to static members with the class form which they came from.

Put the static members in an interface and inherit from that interface.

Answer

Correct Answer: Add a static import.

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78. Which keyword lets you call the constructor of a parent class?

Parent

Super

This

New

Answer

Correct Answer: Super

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79. If you encounter UnsupportedClassVersionError it means the code was _ on a newer version of Java than the JRE _ it.

Executed; interpreting

Executed; compiling

Compiled; executing

Compiled, translating

Answer

Correct Answer: Compiled; executing

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80. You get a NullPointerException. What is the most likely cause?

A file that needs to be opened cannot be found.

A network connection has been lost in the middle of communications.

Your code has used up all available memory.

The object you are using has not been instantiated.

Answer

Correct Answer: The object you are using has not been instantiated.

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81. How does the keyword volatile affect how a variable is handled?

It will be read by only one thread at a time.

It will be stored on the hard drive.

It will never be cached by the CPU.

It will be preferentially garbage collected.

Answer

Correct Answer: It will never be cached by the CPU.

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82. Which type of variable keeps a constant value once it is assigned?

Non-static

Static

Final

Private

Answer

Correct Answer: Final

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83. Which is the most reliable expression for testing whether the values of two string variables are the same?

String1 == string2

String1 = string2

String1.matches(string2)

String1.equals(string2)

Answer

Correct Answer: String1.equals(string2)

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84. What method can be used to create a new instance of an object?

Another instance

Field

Constructor

Private method

Answer

Correct Answer: Constructor

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85. What statement returns true if "nifty" is of type String?

"nifty".getType().equals("String")

"nifty".getType() == String

"nifty".getClass().getSimpleName() == "String"

"nifty" instanceof String

Answer

Correct Answer: "nifty" instanceof String

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86. Object-oriented programming is a style of programming where you organize your program around _ rather than _ and data rather than logic.

Functions; actions

Objects; actions

Actions; functions

Actions; objects

Answer

Correct Answer: Objects; actions

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87. Which statement is NOT true?

An anonymous class may specify an abstract base class as its base type.

An anonymous class does not require a zero-argument constructor.

An anonymous class may specify an interface as its base type.

An anonymous class may specify both an abstract class and interface as base types.

Answer

Correct Answer: An anonymous class does not require a zero-argument constructor.

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88. The runtime system starts your program by calling which function first?

Iterative

Hello

Main

Answer

Correct Answer: Main

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89. Fill in the blank to create a piece of code that will tell whether int0 is divisible by 5: Boolean isDivisibleBy5 = _____

Int0 / 5 ? true: false

Int0 % 5 == 0

Int0 % 5 != 5

Math.isDivisible(int0, 5)

Answer

Correct Answer: Int0 % 5 == 0

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90. Which is the most up-to-date way to instantiate the current date?

New SimpleDateFormat(

New Date(System.currentTimeMillis())

LocalDate.now()

Calendar.getInstance().getTime()

Answer

Correct Answer: LocalDate.now()

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91. By implementing encapsulation, you cannot directly access the class's _ properties unless you are writing code inside the class itself.

Private

Protected

No-modifier

Public

Answer

Correct Answer: Private

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92. You have an ArrayList of names that you want to sort alphabetically. Which approach would NOT work?

Names.sort(Comparator.comparing(String::toString))

Collections.sort(names)

Names.sort(List.DESCENDING)

Names.stream().sorted((s1, s2) -> s1.compareTo(s2)).collect(Collectors.toList())

Answer

Correct Answer: Names.sort(List.DESCENDING)

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93. What does this code print? System.out.print("apple".compareTo("banana"));

Positive number

Negative number

Compilation error

Answer

Correct Answer: Negative number

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94. How do you write a foreach loop that will iterate over ArrayListpencilCase?

For (Pencil pencil : pencilCase) {}

For (pencilCase.next()) {}

For (Pencil pencil : pencilCase.iterator()) {}

For (pencil in pencilCase) {}

Answer

Correct Answer: For (Pencil pencil : pencilCase) {}

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95. Given the following definitions, which of these expression will NOT evaluate to true? Boolean b1 = true, b2 = false; int i1 = 1, i2 = 2;

(i1 | i2) == 3

I2 && b1

B1 || !b2

(i1 ^ i2) < 4

Answer

Correct Answer: I2 && b1

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96. How can you achieve runtime polymorphism in Java?

Method overloading

Method overrunning

Method overriding

Method calling

Answer

Correct Answer: Method overriding

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97. Given the string "strawberries" saved in a variable called fruit, what would fruit.substring(2, 5) return?

Rawb

Raw

Awb

Traw

Answer

Correct Answer: Raw

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98. Data items you use in a call to a method are called ____.

Arguments

Instance variables

Method declarations

Headers

Answer

Correct Answer: Arguments

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99. A literal string is a(n) ____ object.

Named

Anonymous

Class

Lost

Answer

Correct Answer: Anonymous

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100. Abc.compareto("aba") returns ________.

-1

-2

Answer

Correct Answer: 2

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101. If a program compiles fine, but it produces incorrect result, then the program suffers __________.

Java language specification

A logic error

Java ByteCode

X is 2

Answer

Correct Answer: A logic error

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102. In an interview, ____ limit or restrict the response.

Open-ended questions

Closed-ended questions

Leading questions

Range-of-response questions

Answer

Correct Answer: Closed-ended questions

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103. You can use the ________ method to force one thread to wait for another thread to finish.

Sleep(long milliseconds)

Yield()

Stop()

Suspend

Answer

Correct Answer: Sleep(long milliseconds)

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104. Java, c#, and vb.net are examples of ________.

Client operating systems

Object-oriented languages

Thin-client applications

Structured queries

Answer

Correct Answer: Object-oriented languages

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105. On many keyboards, the break key is also the ____ key.

Pause

Esc

Delete

Ctrl

Answer

Correct Answer: Pause

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106. To register a source for an action event with a handler, use ________.

Source.addAction(handler)

Source.setOnAction(handler)

Source.addOnAction(handler)

Source.setActionHandler(handler)

Answer

Correct Answer: Source.setOnAction(handler)

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107. The compiler checks ________.

Syntax errors

Logical errors

Runtime errors

Answer

Correct Answer: Syntax errors

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108. The following code causes java to throw ________. int number = integer.max_value + 1;

Exception

Error

Throwable

RuntimeException

No exceptions

Answer

Correct Answer: No exceptions

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109. The class used as a basis for inheritance is the ____ class.

Base

Child

Derived

Extends

Answer

Correct Answer: Base

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110. Polymorphism means ________.

That data fields should be declared private

That a class can contain another class

That a class can extend another class

That a variable of supertype can refer to a subtype object

Answer

Correct Answer: That a variable of supertype can refer to a subtype object

Note: This Question is unanswered, help us to find answer for this one

111. In java, boolean array elements automatically are assigned the value ____.

Null

'\u0000'

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

112. If you attempt to add an int, a byte, a long, and a float, the result will be a ________ value.

Byte

Int

Long

Double

Answer

Correct Answer: Double

Note: This Question is unanswered, help us to find answer for this one

113. In java, you use variables of type ____ to store integers, or whole numbers.

Num

Double

Var

Int

Answer

Correct Answer: Int

Note: This Question is unanswered, help us to find answer for this one

114. An immutable class cannot have ________.

Public data fields

Private data fields

Public constructors

No-arg constructors

Static data fields

Answer

Correct Answer: Public data fields

Note: This Question is unanswered, help us to find answer for this one

115. 3' - '2' + 'm' / 'n' is ________.

Answer

Correct Answer: 1

Note: This Question is unanswered, help us to find answer for this one

116. The capability to inherit from more than one class is called ____ inheritance.

Multiple inheritance

Collision

Polyinheritance

Dynamic method binding

Answer

Correct Answer: Multiple inheritance

Note: This Question is unanswered, help us to find answer for this one

117. An aggregation relationship is usually represented as in _.

A data field/the aggregating class

A data field/the aggregated class

A method/the aggregating class

A method/the aggregated class

Answer

Correct Answer: A data field/the aggregating class

Note: This Question is unanswered, help us to find answer for this one

118. Declaring instance variables ________ is known as data hiding or information hiding.

Secure

Private

Static

Masked

Answer

Correct Answer: Private

Note: This Question is unanswered, help us to find answer for this one

119. You use the ____ function to return a portion of an array and assign it to another array.

Array_slice()

Array_set()

Array_assign()

Array_key()

Answer

Correct Answer: Array_slice()

Note: This Question is unanswered, help us to find answer for this one

120. The purpose of ____ is to set or change the values of data fields within the class.

Get methods

Put methods

Make methods

Set methods

Answer

Correct Answer: Set methods

Note: This Question is unanswered, help us to find answer for this one

121. The format specifier ________ is a placeholder for an int value.

%a.

%d.

%int.

%s.

Answer

Correct Answer: %d.

Note: This Question is unanswered, help us to find answer for this one

122. The calling method needs to understand only the ____ to the method that is called.

Parameter

In scope

Signature

Interface

Answer

Correct Answer: Interface

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123. Loop ____ is the technique of combining two loops into one.

Fusion

For

Loop

Infinite

Answer

Correct Answer: Fusion

Note: This Question is unanswered, help us to find answer for this one

124. Every object is a _____ of a more general class.

Modifiers

Header

Invoke

Member

Answer

Correct Answer: Member

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125. Division by zero is a ________ error that is caught when the program executes

Compiler

Runtime

Syntax

Execution

Answer

Correct Answer: Runtime

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126. Comparing a variable to a list of values in an array is a process called ____ an array.

Validating

Using

Checking

Searching

Answer

Correct Answer: Searching

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127. Before entering a loop, the first input statement, or ____, is retrieved.

Empty body

Posttest loop

Loop body

Priming read

Answer

Correct Answer: Priming read

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128. A for loop provides a convenient way to create a(n) ____ loop.

Counter-controlled

Posttest

While

Infinite

Answer

Correct Answer: Counter-controlled

Note: This Question is unanswered, help us to find answer for this one

129. A class that represents the most general entity in an inheritance hierarchy is called a/an ____.

Default class.

Superclass.

Subclass.

Inheritance class

Answer

Correct Answer: Superclass.

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130. A ________ method does not return a value.

Void

Non-void

Void method

Answer

Correct Answer: Void

Note: This Question is unanswered, help us to find answer for this one

131. Arguments to methods always appear within ________.

Brackets.

Parentheses.

Curly braces.

Quotation marks

Answer

Correct Answer: Parentheses.

Note: This Question is unanswered, help us to find answer for this one

132. The ____ operator is always evaluated before the or operator.

Assignment

AND

Conditional

Logical

Answer

Correct Answer: AND

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133. The operators =, <, >, <=, >=, and <> are referred to as ____ operators.

Multiple-row

Single-row

Correlated

Multiple column

Answer

Correct Answer: Single-row

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134. The "less than or equal to" comparison operator in java is __________.

<>.

Answer

Correct Answer: <=

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135. Data sent by a program to the screen, a printer, or a file is __________.

String

Integer

Modulus

Output

Answer

Correct Answer: Output

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136. Ascii is able to encode a total of ____ different characters.

256

512

65,536

Answer

Correct Answer: 256

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137. Variables declared within a button's click event handler are ________ variables.

Local

String

Global

Private

Answer

Correct Answer: Local

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138. The term ________ commonly is used to refer to a string that is part of another string.

Nested string

Literal

Substring

Delimiter

Answer

Correct Answer: Substring

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139. The size of ________ can grow and shrink at runtime.

An array

An ArrayList

Answer

Correct Answer: An ArrayList

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140. The primitive data types only allow a(n) ________ to hold a single value.

Variable

Object

Class

Literal

Answer

Correct Answer: Variable

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141. The not equal comparison operator in java is ________.

!= =

Answer

Correct Answer: !=

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142. The length of a string can be determined by ________.

The String method length()

The String instance variable length

The String method strlen()

All of the above

Answer

Correct Answer: The String method length()

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143. The keyword ________ is required to declare a class.

Private

Class

Public

All of the above

Answer

Correct Answer: Class

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144. Sql ________ statements may change the contents of a database.

SELECT

UPDATE

DELETE

INSERT

Answer

Correct Answer: UPDATE
DELETE
INSERT

Note: This question has more than 1 correct answers

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145. Invoking ________ removes all elements in an arraylist x.

X.empty()

X.delete()

X.remove()

X.clear()

X.clean

Answer

Correct Answer: X.clear()

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146. Information is passed to a method in ________.

The method name

That method's return

The method body

The arguments to the method

Answer

Correct Answer: The arguments to the method

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147. If a key is not in the list, the binarysearch method returns ________.

Insertion point

Insertion point - 1

(insertion point + 1)

Insertion point

Answer

Correct Answer: (insertion point + 1)

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148. A(n) ________ indicates a problem that occurs while a program executes.

Syntax error

Omitted import

Missing semicolon

Exception

Answer

Correct Answer: Exception

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149. A variable or a value listed in a call to a method is called ________.

A parameter

An argument

A local variable

A global variable

Answer

Correct Answer: An argument

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150. A java virtual machine is actually a ________.

Program compiler

JDBC data source

Bytecode interpreter

JDBC driver

Answer

Correct Answer: Bytecode interpreter

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151. ________ is a data structure to store data in sequential order.

A list

A set

A tree

A stack

A queue

Answer

Correct Answer: A list

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152. Declaring main as ________ allows the jvm to invoke main without creating an instance of the class.

Public

Void

Static

Final

Answer

Correct Answer: Static

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153. Some programmers refer to a catch block as a ____ clause.

Method

Phrase

Statement

Clause

Answer

Correct Answer: Clause

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154. Local variables must be ________.

Initialized when they're declared

Initialized before their values are used in expression

Declared and initialized in two steps

Declared at the top of the main method's body

Answer

Correct Answer: Initialized before their values are used in expression

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155. When you create an array of objects, each reference is assigned the value ____.

Null

Is never

Field

‘\u0000

Answer

Correct Answer: Null

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156. When they have the same name, variables within ____ of a class override the class’s fields.

Composition

Nested

Memory

Methods

Answer

Correct Answer: Methods

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157. The purpose of a(n) ____ is to return a value to the world outside the class.

Get method

Set method

Pull method

Access method

Answer

Correct Answer: Get method

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158. The class ____ is the base of the classes designed to handle exceptions.

Class

Exception

Logic_error

Runtime_error

Answer

Correct Answer: Exception

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159. The ________ method is used to display a message dialog.

Input dialog

ShowMessageDialog

Variable

Literal

Answer

Correct Answer: ShowMessageDialog

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160. The ________ method immediately terminates the program.

System.terminate(0);

System.halt(0);

System.exit(0);

System.quit(0);

System.stop(0

Answer

Correct Answer: System.exit(0);

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161. The ____ method converts any object to a string.

Substring()

Replace()

ConvertString()

ToString()

Answer

Correct Answer: ToString()

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162. Methods that set values are called ____ methods.

Mutator

Modifier

Access

Creator

Answer

Correct Answer: Mutator

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163. Methods that retrieve values are called ____ methods.

Class

Accessor

Static

Mutator

Answer

Correct Answer: Accessor

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164. If a number is too large to be stored in a variable of the float type, it ________.

Causes overflow

Causes underflow

Cannot happen in Java

Causes no error

Answer

Correct Answer: Causes overflow

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165. Exceptions can be thrown by ________.

The Java Virtual Machine.

Code in a try block.

Calls from a try block to other methods

All of the above

Answer

Correct Answer: All of the above

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166. Exception handling helps you create ________ programs.

Compilation-error-free

Fault-tolerant

Logic-error-free

High-performance

Answer

Correct Answer: Fault-tolerant

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167. Every event object has the _____ method that returns the object that triggered the event.

GetSource()

GetActionCommand()

GetTimeStamp()

GetWhen()

GetKeyChar

Answer

Correct Answer: GetSource()

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168. A(n) ____ is a variable that holds a memory address.

Character

Buffer

Reference

Immutable

Answer

Correct Answer: Reference

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169. A variable defined inside a method is referred to as ________.

A global variable

A method variable

A block variable

A local variable

Answer

Correct Answer: A local variable

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170. A static method can ________.

Call only other static methods of the same class directly.

Manipulate only static fields in the same class directly.

Be called using the class name and a dot (.).

All of the above

Answer

Correct Answer: All of the above

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171. The ____ method takes a string argument and returns its double value.

ParseDouble

ReturnDouble

ParseInt

ParseString

Answer

Correct Answer: ParseDouble

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172. To append data to an existing file, you open it with the ____________ method.

AppendText

NewText

ExistingText

None of these

Answer

Correct Answer: AppendText

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173. A method must declare to throw ________.

Error

Checked exceptions

Unchecked exceptions

Routine exceptions

Answer

Correct Answer: Checked exceptions

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174. _______ is a construct that defines objects of the same type.

A class

An object

A data field

A method

Answer

Correct Answer: A class

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175. ________ algorithms are used to arrange random data into some order.

Sorting

Shuffling

Binary Search

None of these

Answer

Correct Answer: Sorting

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176. The iterator() method returns an instance of the ________ interface.

Iterator

Collection

Iterable

ArrayList

Answer

Correct Answer: Iterator

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177. A return statement without any value can be used in ________.

Void Method

Non Void Method

Both

None

Answer

Correct Answer: Void Method

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178. You use a ____ statement within a try block to specify an error message.

Catch

Call

Throw

None of these

Answer

Correct Answer: Throw

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179. You use ________ to run a java program.

Java interpreter

Java processor

Java compiler

None of these

Answer

Correct Answer: Java interpreter

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180. You can leave out the ____ statements in a switch structure.

Break

Case

Switch

None

Answer

Correct Answer: Break

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181. When you return an array from a method, the method returns ________.

Copy of the array

Reference of the array

Copy of the first element

None of these

Answer

Correct Answer: Reference of the array

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182. When you place a block within an if statement, it is crucial to place the ____ correctly.

Periods

Curly braces

Angle brackets

None of these

Answer

Correct Answer: Curly braces

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183. When you derive a class from an existing class, you ________ add new data and functions.

Never

May

Must

May not

Answer

Correct Answer: May

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184. When reading words using a scanner object's next method, ____.

Any characters at the beginning of the input that are considered to be white space are consumed and become part of the word being read.

Any characters at the beginning of the input that are considered to be white space are consumed and do not become part of the word being read.

The program must discard white space characters at the beginning of the input before calling the next method.

Any characters that are considered to be white space within the word become part of the word.

Answer

Correct Answer: The program must discard white space characters at the beginning of the input before calling the next method.

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185. When invoking a method with an object argument, ___________ is passed.

Contents of the object

Copy of the object

Reference of the object

None of these

Answer

Correct Answer: Reference of the object

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186. When calling this() from a constructor, it must be the ____ statement within the constructor.

First

Middle

Final

Any of these

Answer

Correct Answer: First

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187. When an object of one class is a data field within another class, they are related by ____.

Composition

Extension

Explanation

None of these

Answer

Correct Answer: Composition

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188. When an object is passed as an argument, ________ is passed into the parameter variable.

A reference to the object

Value

Class

None of these

Answer

Correct Answer: A reference to the object

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189. When an exception occurs it is said to have been ________.

Thrown

Caught

Declared

Handled

Answer

Correct Answer: Thrown

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190. When an array is passed to a function, it is actually ________ the array that is/are passed.

A copy of all the values in

The starting memory address of

The value of

None of these

Answer

Correct Answer: The starting memory address of

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191. When an application is run, the method that must be executed first must be named ____.

First

Main

Void

None of these

Answer

Correct Answer: Main

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192. When a method is declared with the ________ modifier, it cannot be overridden in a subclass.

Public

Final

Super

Void

Answer

Correct Answer: Final

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193. When a method ____ another, it takes precedence over the method, hiding the original version.

Overrides

Underrides

Merges

None of these

Answer

Correct Answer: Overrides

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194. When a character is stored in memory, it is actually the ________ that is stored.

Unicode number

Floating point value

ASCII code

None of these

Answer

Correct Answer: ASCII code

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195. Variables defined in the method header are called ________.

Formal Parameters

Informal Parameters

Local Variable

Global Variable

Answer

Correct Answer: Formal Parameters

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196. To use a public variable or method outside of its class, you must ____ the name.

Bind

Qualify

Encapsulate

Instantiate

Answer

Correct Answer: Qualify

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197. To make an int a double you would use a ______.

Double d = i

D=Double i

Both

None

Answer

Correct Answer: Double d = i

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198. To assign a double variable d to a float variable x, you write ________.

X=(long)d

X=(float)d

X=(int)d

None of these

Answer

Correct Answer: X=(float)d

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199. The uml uses ________ before a member name to indicate that the member is public.

Answer

Correct Answer: +

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200. The syntax ____ assigns a return value to a variable.

Answer

Correct Answer: *

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201. The simplest statement you can use to make a decision is the ____ statement.

This

Boolean

True/False

Answer

Correct Answer: If

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202. The signature of a method consists of ________.

Method name

Parameter list

Return type

Both a and b

Answer

Correct Answer: Both a and b

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203. The relationship created with composition is called a(n) ____ relationship.

Was-is

Has-is

Has-a

None of these

Answer

Correct Answer: Has-a

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204. The relationship between an interface and the class that implements it is ________.

Inheritence

Composition

Encapsulation

Polymerization

Answer

Correct Answer: Inheritence

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205. The purpose of the __________ is to get the first input value for the validation of a loop.

Primary read

Secondary read

Both

None

Answer

Correct Answer: Primary read

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206. The methods for modifying element in the ________ class are synchronized.

ArrayList

LinkedList

TreeMap

Vector

Answer

Correct Answer: ArrayList

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207. The method header of the equals() method within the string class is ____.

Public Boolean Strings

Private Boolean Strings

Both

None

Answer

Correct Answer: Public Boolean Strings

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208. Predefined types such as int, double, and char are ____ types.

Value

Variable

Both

None

Answer

Correct Answer: Value

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209. One or more objects may be created from a(n)________.

Field

Class

Method

Instance

Answer

Correct Answer: Class

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210. Java uses ________ to reference the current object.

Constructor

Destructor

Parameterless

Parameterized

Answer

Correct Answer: Constructor

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211. Java requires a ________ call for every object that's created.

Constructor

Destructor

Parameterless

Parameterized

Answer

Correct Answer: Constructor

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212. In java, ________ must be declared before they can be used.

Variables

Literals

Key words

None of these

Answer

Correct Answer: Variables

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213. If an exception occurs in a try-catch block, the code in the finally clause ________.

Is executed

Is not executed

May or may not be executed

None of these

Answer

Correct Answer: Is executed

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214. Every class in java, except ________, extends an existing class.

Integer

Object

Class

Srring

Answer

Correct Answer: Object

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215. Assume s is "" abc "", the method ________ returns a new string ""abc"".

S.trim(s)

Trim(s)

String.trim(s)

S.trim()

Answer

Correct Answer: S.trim()

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216. To check whether a char variable ch is an uppercase letter, you write ________.

(ch >= 'A' && ch >= 'Z')

(ch >= 'A' && ch <= 'Z')

(ch >= 'A' || ch <= 'Z')

('A' <= ch <= 'Z

Answer

Correct Answer: (ch >= 'A' && ch <= 'Z')

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217. A method that has no implementation is called a/an ____ method.

Abstract

Overloaded

Interface

Implementation

Answer

Correct Answer: Abstract

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218. A method header is also called a(n) _____.

Argument

Address

Statement

Declaration

Object

Answer

Correct Answer: Declaration

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219. The system.currenttimemillis() returns ________.

X = (float)d;

The current time in milliseconds since midnight, January 1, 1970 GMT (the Unix time)

Final double PI = 3.14159;

None of these

Answer

Correct Answer: The current time in milliseconds since midnight, January 1, 1970 GMT (the Unix time)

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220. The static method ________ of class string returns a formatted string.

Printf

Format

FormatString

ToFormatedString

Answer

Correct Answer: Format

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221. The setonaction method is defined in ________.

Label

Labelled

Node

ButtonBase

Answer

Correct Answer: ButtonBase

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222. The compiler determines which version of a method to call by the method?s ____.

Name

Signature

Output

Constructor

Answer

Correct Answer: Signature

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223. In java, the word true is ________.

A Java keyword

A Boolean literal

Same as value 1

Same as value 0

Answer

Correct Answer: A Boolean literal

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224. An indefinite loop is a(n) ____ loop

Counter Controlled

Event controlled

Both of these

None of these

Answer

Correct Answer: Event controlled

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225. A(n) ____ constructor is one that requires no arguments.

Class

Explicit

Default

Write

Answer

Correct Answer: Default

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226. A javafx action event handler is an instance of ________.

ActionEvent

Action

EventHandler

Answer

Correct Answer: EventHandler

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227. A javafx action event handler contains a method ________.

Public void actionPerformed(ActionEvent e)

Public void actionPerformed(Event e)

Public void handle(ActionEvent e)

Public void handle(Event e

Answer

Correct Answer: Public void handle(ActionEvent e)

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228. A java character is stored in ________.

One byte

Two bytes

Three bytes

Four bytes

Answer

Correct Answer: Two bytes

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229. ________ represents an entity in the real world that can be distinctly identified.

An object

A data field

A class

A method

Answer

Correct Answer: An object

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230. ____ media files are accessed through a link that your web site visitor clicks.

External

Internal

Multimidia

None of these

Answer

Correct Answer: External

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231. To obtain the current minute, use ________.

System.currentTimeMillis() % 3600

System.currentTimeMillis() % 60

System.currentTimeMillis() / 1000 % 60

System.currentTimeMillis() / 1000 / 60 % 60

System.currentTimeMillis() / 1000 / 60 / 60 % 24

Answer

Correct Answer: System.currentTimeMillis() / 1000 / 60 % 60

Note: This Question is unanswered, help us to find answer for this one

232. The expression "java " + 1 + 2 + 3 evaluates to ________.

Java123

Java6

Java33

Java53

Answer

Correct Answer: Java123

Note: This Question is unanswered, help us to find answer for this one

233. Assume calendar calendar = new gregoriancalendar(). ________ returns the week of the year.

Calendar.get(Calendar.MONTH)

Calendar.get(Calendar.MONTH_OF_YEAR)

Calendar.get(Calendar.WEEK_OF_MONTH)

Calendar.get(Calendar.WEEK_OF_YEAR)

Answer

Correct Answer: Calendar.get(Calendar.WEEK_OF_YEAR)

Note: This Question is unanswered, help us to find answer for this one

234. Assume calendar calendar = new gregoriancalendar(). ________ returns the number of days in a month.

Calendar.get(Calendar.MONTH)

Calendar.get(Calendar.MONTH_OF_YEAR)

Calendar.get(Calendar.WEEK_OF_MONTH)

Calendar.get(Calendar.WEEK_OF_YEAR)

Calendar.getActualMaximum(Calendar.DAY_OF_MONTH

Answer

Correct Answer: Calendar.getActualMaximum(Calendar.DAY_OF_MONTH

Note: This Question is unanswered, help us to find answer for this one

235. Assume calendar calendar = new gregoriancalendar(). ________ returns the month of the year.

Calendar.get(Calendar.MONTH)

Calendar.get(Calendar.MONTH_OF_YEAR)

Calendar.get(Calendar.WEEK_OF_MONTH)

Calendar.get(Calendar.WEEK_OF_YEAR)

Answer

Correct Answer: Calendar.get(Calendar.MONTH)

Note: This Question is unanswered, help us to find answer for this one

236. When method printf requires multiple arguments, the arguments are separated with ________.

Colons (:)

Semicolons (;)

Commas (,)

Periods

Answer

Correct Answer: Commas (,)

Note: This Question is unanswered, help us to find answer for this one

237. "abcdefgh".substring(1, 3) returns ________.

Abc

Bcd

Cde

Answer

Correct Answer: Bc

Note: This Question is unanswered, help us to find answer for this one

238. You compare two strings s1 and s2 using ________.

Compare(s1, s2)

S1.compare(s2)

CompareTo(s1, s2)

S1.compareTo(s2

Answer

Correct Answer: S1.compareTo(s2

Note: This Question is unanswered, help us to find answer for this one

239. If a programming language does not support ____, the language is not considered object-oriented.

Polymorphism

Syntax

Applets

Loops. polymorphism

Answer

Correct Answer: Polymorphism

Note: This Question is unanswered, help us to find answer for this one

240. You use the keyword ________ to reference a method in the superclass from a subclass.

That.

This.

SuperObject.

Super

Answer

Correct Answer: Super

Note: This Question is unanswered, help us to find answer for this one

241. To place two nodes node1 and node2 in a hbox p, use ________.

P.add(node1, node2);

P.addAll(node1, node2);

P.getChildren().add(node1, node2);

P.getChildren().addAll(node1, node2)

Answer

Correct Answer: P.getChildren().addAll(node1, node2)

Note: This Question is unanswered, help us to find answer for this one

242. To handle the mouse click event on a pane p, register the handler with p using ________.

P.setOnMouseClicked(handler);

P.setOnMouseDragged(handler);

P.setOnMouseReleased(handler);

P.setOnMousePressed(handler

Answer

Correct Answer: P.setOnMouseClicked(handler);

Note: This Question is unanswered, help us to find answer for this one

243. You use the _________ operator to access members of an object.

;

Answer

Correct Answer: .

Note: This Question is unanswered, help us to find answer for this one

244. To create an instance of bigdecimal for 454.45, use ________.

BigInteger(454.45);

New BigInteger(454.45);

BigInteger("454.45")

New BigDecimal("454.45")

Answer

Correct Answer: New BigDecimal("454.45")

Note: This Question is unanswered, help us to find answer for this one

245. You can declare two variables with the same name in __________.

Method one as a formal parameter and the other as a local variable

A block

Two nested blocks in a method (two nested blocks means one being inside the other)

Different methods in a class

Answer

Correct Answer: Different methods in a class

Note: This Question is unanswered, help us to find answer for this one

246. Thread-local storage is data that ____.

Is not associated with any process

Has been modified by the thread, but not yet updated to the parent process

Is generated by the thread independent of the thread's process

Is unique to each thread

Answer

Correct Answer: Is unique to each thread

Note: This Question is unanswered, help us to find answer for this one

247. A ____ is a structure that allows repeated execution of a block of statements.

Sequence

Selection

Loop

Array.

Answer

Correct Answer: Loop

Note: This Question is unanswered, help us to find answer for this one

248. ____ variables are variables that are shared by every instantiation of a class.

Tasks

Masks

Class

Composition

Answer

Correct Answer: Class

Note: This Question is unanswered, help us to find answer for this one

249. ____ occurs when both of the operands are integers.

Data modeling

Type cast

Integer division

Unlike assignment

Answer

Correct Answer: Integer division

Note: This Question is unanswered, help us to find answer for this one

250. ____ is the process of ensuring that a value falls within a specified range.

Value checking

Data integrity

Validating data

A range check

Answer

Correct Answer: Data integrity

Note: This Question is unanswered, help us to find answer for this one

251. ____ is a complete programming language that can be used to create stand-alone applications.

HTLM

CSS

JavaScript

JAVA

Answer

Correct Answer: JAVA

Note: This Question is unanswered, help us to find answer for this one

252. The public constructors and methods of a class form the public _____ of the class.

Initialization

Encapsulation

Implementation

Interface

Answer

Correct Answer: Interface

Note: This Question is unanswered, help us to find answer for this one

253. Static methods can only operate on ________ fields.

Global

Instance

Static

Local

Answer

Correct Answer: Static

Note: This Question is unanswered, help us to find answer for this one

254. Math.pow(3, 3) returns ________.

27.0

9.0

Answer

Correct Answer: 27.0

Note: This Question is unanswered, help us to find answer for this one

255. Java uses class ________ to represent colors using their rgb values.

Color

Colors

RGBColor

RGBColors

Answer

Correct Answer: Color

Note: This Question is unanswered, help us to find answer for this one

256. In java all output uses the ______ data type.

Int

Scan

String

Double

Char

Answer

Correct Answer: String

Note: This Question is unanswered, help us to find answer for this one

257. Calculations are normally performed by ____________ statements.

If statement

Comments

Assignment statements

/ division and % remainder

Answer

Correct Answer: Assignment statements

Note: This Question is unanswered, help us to find answer for this one

258. An object is an instance of a ________.

Data

Class

Program

Method

Answer

Correct Answer: Class

Note: This Question is unanswered, help us to find answer for this one

259. All java applications must have a method ________.

Public static Main(String[] args)

Public static Main(String args[])

Public static void main(String[] args)

Public void main(String[] args)

Public static main(String[] args)

Answer

Correct Answer: Public static void main(String[] args)

Note: This Question is unanswered, help us to find answer for this one

260. A final field should also be declared ________ if it is initialized in its declaration.

Private

Public

Protected

Static

Answer

Correct Answer: Static

Note: This Question is unanswered, help us to find answer for this one

261. A constructor can access ________.

A local variable defined in any method

A private instance variable

A public instance variable

A static variable

Answer

Correct Answer: A private instance variable

Note: This Question is unanswered, help us to find answer for this one

262. A class specifies the and that a particular type of object has.

Fields; methods

Class; objects

Instance; fields

None of these

Answer

Correct Answer: Fields; methods

Note: This Question is unanswered, help us to find answer for this one

263.
public class Test{
private int qusNo = 100;
}
What can directly access and change the value of the variable qusNo?

Any class in com.mypackage package

Only the Test class

Any class that extends Test

Any class

Answer

Correct Answer:

Only the Test class

Note: This Question is unanswered, help us to find answer for this one

264. What is the output of this program? class Upwork{ public static void main(String args[]) { int g = 3; System.out.print(++g * 8); } }

Answer

Correct Answer: 32

Note: This Question is unanswered, help us to find answer for this one

265. Which of the following are true?

A local variable of type boolean defaults to null.

A local variable of type float defaults to 0.

A local variable of type Object defaults to null.

A local variable of type boolean defaults to false.

A local variable of type boolean defaults to true.

A local variable of type float defaults to 0.0.

None of the above

Answer

Correct Answer: A local variable of type float defaults to 0.

Note: This Question is unanswered, help us to find answer for this one

266. Which implicit modifier is applied to all interface methods?

default

abstract

void

static

public

protected

final

Answer

Correct Answer: public

Note: This Question is unanswered, help us to find answer for this one

267. Which of the following would be the correct way to compile and run a Java console application in file called App.java?

javac App.java java App

javac App java App.java

javac App.java java App.java

javac App java App

Answer

Correct Answer: javac App.java java App.java

Note: This Question is unanswered, help us to find answer for this one

268. Which of the following checks are performed by compiler when you override a nonprivate method?

The method in the child class must have the same signature as the method in the parent class.

The method in the child class must be less accessible than the method in the parent class.

If the parent doesn't have a no-argument constructor, the compiler requires an explicit call to a child constructor in each parent constructor.

The method in the child class may not throw a checked exception that is new or braoder than the class of any exception thrown in the parent class method.

Answer

Correct Answer: The method in the child class must have the same signature as the method in the parent class.
The method in the child class must be less accessible than the method in the parent class.
The method in the child class may not throw a checked exception that is new or braoder than the class of any exception thrown in the parent class method.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

269. What is the value of "d" after this line of code has been executed? double d=Math.round(2.5+Math.round());

2.5

Answer

Correct Answer: 3

Note: This Question is unanswered, help us to find answer for this one

270.
Which statement is true about the given code? public class Test78 { public static void main(String[] args) throws Exception { new JBean().setHeight(1).setWidth(2).setDepth(3).setDensity(9); } } class JBean { private int height, width, depth, density; public JBean setHeight (int h) { this.height = h; return this; } public JBean setWidth (int w) { this.width = w; return this; } public JBean setDepth (int d) { this.depth = d; return this; } public JBean setDensity (int d) { this.density = d; return this; } }

The code does not compile, because two setters have a formal parameter with the same name.

The setters of the JBean class are JavaBean-compliant.

The code compiles, but throws a NullPointerException at run-time.

The code compiles and runs.

Answer

Correct Answer:

The code compiles and runs.

Note: This Question is unanswered, help us to find answer for this one

271.
What is the output of the given code? public class Test15 { public static void main(String[] args) { VO a = new VO(2); VO b = new VO(3); swapONE(a, b); print(a, b); swapTWO(a, b); print(a, b); } private static void print(VO a, VO b) { System.out.print(a.toString() + b.toString()); } public static void swapONE(VO a, VO b) { VO tmp = a; a = b; b = tmp; } public static void swapTWO(VO a, VO b) { int tmp = a.x; a.x = b.x; b.x = tmp; } } class VO { public int x; public VO(int x) { this.x = x; } public String toString() { return String.valueOf(x); } }

2332

3232

3223

2323

Answer

Correct Answer:

2332

Note: This Question is unanswered, help us to find answer for this one

272. Which type(s) cannot be used as generics?

primitives

enum types

Inner classes

Answer

Correct Answer: primitives
enum types

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

273.
Which of the following are true? (Choose all that apply) public class UpWork { public
staic void main(String[] args) { UpWorkupw = new UpWork(); }}

Upwork is a class.

upw is a class.

main is a class.

UpWork is a reference to an object.

upw is a reference to an object.

main is a reference to an object.

None of the above.

Answer

Correct Answer:

Upwork is a class.

upw is a reference to an object.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

274. How we can make entity class or method final in JPA ?

Mark class or method as final in JPA.

Only class can be marked as final but not method in JPA.

Only method can be marked as final but not class in JPA.

Neither entity class nor methods can be marked as final in JPA.

Answer

Correct Answer: Neither entity class nor methods can be marked as final in JPA.

Note: This Question is unanswered, help us to find answer for this one

275. What is required for EJB asynchronous method?

Method must return void or implementation of Future interface.

Async method may not throw exceptions.

Async method must have timeout parameter.

None of the above

Answer

Correct Answer: Method must return void or implementation of Future interface.

Note: This Question is unanswered, help us to find answer for this one

276. Which of the following are true? (Choose all that apply)

An instance variable of type boolean defaults to false.

An instance variable of type boolean defaults to true.

An instance variable of type boolean defaults to null;

An instance variable of type int defaults to 0.

An instance variable of type int defaults to 0.0.

An instance variable of type int defaults to null.

None of the above.

Answer

Correct Answer: An instance variable of type boolean defaults to false.
An instance variable of type int defaults to 0.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

277.
What would be the result of the following code? public class Quest { int i=0; public static void main(String argv[]) { } Quest() { top: while(i <2) { System.out.println(i); i++; continue top; } } }

The code will compile but will not output anything at runtime.

The code will compile and output 0.

The code will compile and output 0 followed by 1.

The code will not compile as a target label cannot appear before the corresponding continue or break statement.

Answer

Correct Answer:

The code will not compile as a target label cannot appear before the corresponding continue or break statement.

Note: This Question is unanswered, help us to find answer for this one

278.
What is the output of the given program? public class Test96 { public static void main(String[] args) { int[] a = new int[2]; System.out.println(a.length); } }

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

279.
Given the following class, which of the following is true? (Choose all that apply) 1: public class UpWork { 2: 3: public void freelancer(boolean time) { 4: 5: if (time) { 6: 7: } 8: System.out.println(result); 9: 10: } 11: }

If String result = "job"; is inserted on line 2, the code will compile.

If String result = "job"; is inserted on line 4, the code will compile.

If String result = "job"; is inserted on line 6 the code will compile.

If String result = "job"; is inserted on line 9, the code will compile.

None of the above changes will make the code compile.

Answer

Correct Answer: If String result = "job"; is inserted on line 2, the code will compile.
If String result = "job"; is inserted on line 4, the code will compile.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

280.
public interface Foo { int k = 4; /* Line 3 */ } Which three piece of codes are equivalent to line 3? 1, final int k = 4; public int k = 4; static int k = 4; abstract int k = 4; volatile int k = 4; protected int k = 4;

1, 2 and 3

2, 3 and 4

3, 4 and 5

4, 5 and 6

Answer

Correct Answer: 3, 4 and 5

Note: This Question is unanswered, help us to find answer for this one

281.
Which one of the following will declare an array and initialize it with five numbers?

Array a = new Array(5);

int [] a = {23,22,21,20,19};

int a [] = new int(5);

int [5] array;

Answer

Correct Answer: int [] a = {23,22,21,20,19};

Note: This Question is unanswered, help us to find answer for this one

282.
What is the purpose of a class constructor?

To pass values to methods for a class

To make objects initially have certain values when they are instantiated

To extend a class

To instantiate an object

Answer

Correct Answer: To make objects initially have certain values when they are instantiated

Note: This Question is unanswered, help us to find answer for this one

283.
Which of the following snippets of code can be used to instantiate an object?

AClass.instantiate();

AClass.newClass()

AClass.create();

Class A = new AClass();

Answer

Correct Answer: Class A = new AClass();

Note: This Question is unanswered, help us to find answer for this one

284.
What will be the value of a? let a = -1 ? 'foo' ? null : -1 : 1;

foo

null

-1

Answer

Correct Answer: null

Note: This Question is unanswered, help us to find answer for this one

285.
Which statement is true for below code:- String s1 = "UpWork"; String s2 = "UpWork"; StringBuilder sb1 = new StringBuilder(); sb1.append("Up").append("Work"); System.out.println(s1 == s2); System.out.println(s1.equals(s2)); System.out.println(sb1.toString() == s1); System.out.println(sb1.toString().equals(s1));

true is printed out exactly once.

true is printed out exactly twice.

true is printed out exactly three times.

true is printed out exactly four times.

The code does not compile.

Answer

Correct Answer: true is printed out exactly three times.

Note: This Question is unanswered, help us to find answer for this one

286.
Which class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

java.lang.String

java.lang.Double

java.lang.StringBuffer

java.lang.Character

Answer

Correct Answer: java.lang.StringBuffer

Note: This Question is unanswered, help us to find answer for this one

287.
Which statement is true about the "switch" construct?

The "default" statement must be placed after all other case statements.

After the matching "case" is found and executed, the execution will always continue with the first statement right after the "switch" construct.

The "default" statement will always execute.

The "default" statement will execute, if no matching "case" statement is found.

Answer

Correct Answer: The "default" statement will execute, if no matching "case" statement is found.

Note: This Question is unanswered, help us to find answer for this one

288.
Which of the following is the valid declaration of a method within an interface definition?

public double methoda();

public final double methoda();

static void methoda(double d1);

protected void methoda(double d1);

Answer

Correct Answer: public double methoda();

Note: This Question is unanswered, help us to find answer for this one

289.
Which of the following is a valid keyword in java?

interface

string

Float

unsigned

Answer

Correct Answer: interface

Note: This Question is unanswered, help us to find answer for this one

290.
Which keyword prevents a class from being extended by another class?

finally

finalize

final

prevent

Answer

Correct Answer: final

Note: This Question is unanswered, help us to find answer for this one

291.
Which of the following is the best way to compare the values stored in two objects?

Using two equal signs eg. ==

Overriding equals() Method

Overriding toString() Method

Overriding clone() Method

Answer

Correct Answer: Overriding equals() Method

Note: This Question is unanswered, help us to find answer for this one

292.
Which of the following is a short circuit operator? (Check all that apply)

Answer

Correct Answer: &&
||

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

293.
What is TypeError?

It's a human-friendly string with description about unexpected variable type used

It's an object with message parameter

It's instance of Error which has the name of TypeError and message property with human-friendly message

It's instance of TypeError which has some own methods to get human-friendly error message and has name of TypeError

Answer

Correct Answer: It's a human-friendly string with description about unexpected variable type used
It's an object with message parameter

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

294.
Which of the following is a valid declaration of a String?

String s1 = null;

String s2 = 'null';

String s3 = (String) 'abc';

String s4 = (String) '\ufeed';

Answer

Correct Answer: String s1 = null;

Note: This Question is unanswered, help us to find answer for this one

295.
Which of the following are correct Constructor Rules?

The first statement of every constructor is a call to another constructor within the class using this(), or a call to a constructor in the direct parent class using super().

The super() call may not be used after the first statement of the constructor.

If no super() call is declared in a constructor, Java will insert a no-argument super() as the first statement of the constructor.

Any constructor in the child class must be at least as accessible or more accessible than the constructor in the parent class.

If the parent doesn't have a no-argument constructor and the child doesn't define any constructors, the compiler will throw an error and try to insert a default no-argument constructor into the child class.

Answer

Correct Answer: The first statement of every constructor is a call to another constructor within the class using this(), or a call to a constructor in the direct parent class using super().

Note: This Question is unanswered, help us to find answer for this one

296.
Which is a reserved word in the Java programming language?

method

native

subclasses

reference

array

Answer

Correct Answer: native

Note: This Question is unanswered, help us to find answer for this one

297.
Which of the following is used to find out that a thread is still running?

run()

Alive()

isAlive()

checkcRun()

Answer

Correct Answer: isAlive()

Note: This Question is unanswered, help us to find answer for this one

298.
Consider below code: class Ex1{ public static void main(String args[]){ int x = 10; int y = new Ex1().change(x); System.out.print(x+y); } int change(int x){ x=12; return x; } } What will be the output?

Compilation fails.

An exception is thrown at runtime.

Answer

Correct Answer: 22

Note: This Question is unanswered, help us to find answer for this one

299.
What do JS classes support?

Super calls

Static methods

Prototype-based inheritance

Constructors

All of these

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

300.
Which assignments are valid, if put instead of /* [placeholder] / in the given code? (check any that apply)

public class Test114 {

public static void main(String[] args) {

class A { class A2{} }

class A2 extends A {}

/ [placeholder] */

}

}

A a = new A2();

A a = new A.A2();

A.A2 a = new A().new A2();

A.A2 a = new A2().new A2();

Answer

Correct Answer: A a = new A2();
A.A2 a = new A().new A2();
A.A2 a = new A2().new A2();

Note: This question has more than 1 correct answers

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301.
Which of the following are valid ways to define a thread in Java?

Create a subclass of java.lang.Thread class

Create a class that implements java.lang.Runnable

Define method run() in a class

Define method call() in a class

Answer

Correct Answer: Create a subclass of java.lang.Thread class
Create a class that implements java.lang.Runnable

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

302.
Select all correct statements:

The same package can be imported more than once in the same source file.

Empty Java files compile without errors.

Importing java.lang package is not mandatory.

A Java source file that contains only import statements compiles without errors.

Answer

Correct Answer: Empty Java files compile without errors.
Importing java.lang package is not mandatory.
A Java source file that contains only import statements compiles without errors.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

303.
Which statement is false?

When a subclass method with the same name and argument as its superclass is called, the superclass method is automatically called.

The "super" keyword cannot be used to call an abstract method.

An abstract class can have method implementation.

Answer

Correct Answer: When a subclass method with the same name and argument as its superclass is called, the superclass method is automatically called.

Note: This Question is unanswered, help us to find answer for this one

304.
What will be the output of the below code? class App{ public static void main(String[] args){ try{ System.out.print("1"); throw new Exception(); System.out.print("2"); } catch(Exception ex){ System.out.print("3"); throw ex; } } }

123

Code will not compile

Answer

Correct Answer: Code will not compile

Note: This Question is unanswered, help us to find answer for this one

305.
What will be the output of the following program? class Upwork { public static void main(String args[]) { try { System.out.println("Hello World"); } finally { System.out.println("Finally executing"); } } }

Nothing. The program will not compile as no exceptions are specified

Nothing. The program will not compile as no catch clauses are specified

Hello World

Hello World Finally executing

Answer

Correct Answer: Hello World Finally executing

Note: This Question is unanswered, help us to find answer for this one

306.
What is the output of the given program? public class Test71 { public static void main(String[] args) { System.out.println(new Child().toString()); } } class Parent { public String toString() { return this.getClass().getName(); } } class Child extends Parent {}

Parent

Child

Class

null

Answer

Correct Answer: Child

Note: This Question is unanswered, help us to find answer for this one

307.
Which statement is true about the given program? public class Test25 { public static void main(String[] args) { final byte a = 20; final byte b = 4; final byte c = a + b; System.out.println(c); } }

It does not compile (compiler error).

It compiles, but does not run (throws an exception during run-time).

It compiles, runs, outputs 24 and exits.

It compiles, runs, but never exits.

Answer

Correct Answer: It compiles, runs, outputs 24 and exits.

Note: This Question is unanswered, help us to find answer for this one

308.
What will be the output when the following code is compiled and run? public class Test { public static void main(String args[]) { int i; i = 3; System.out.println((int) i * 2.5 / 3.0); } }

The code will compile, but it will throw an exception when it is run.

The code will compile and it will not produce any output when it is run.

The code will fail to compile.

The code will print 3.

The code will print 2.5.

The code will print 2.

Answer

Correct Answer: The code will print 2.5.

Note: This Question is unanswered, help us to find answer for this one

309.
What is the output of the given console application? public class Main { public static void main(String[] args) { final int X = 9; int[][] a = {{5, 4, 3}, {9, 7, 2}, {1, 6, 8}}; for (int i=0; i<3; i++) { for (int j=0; j<3; j++) { if (a[i][j] == X) break; System.out.print(a[i][j] + " "); } } } }

5 4 3

5 4 3 1 6 8

5 4 3 7 2 1 6 8

Answer

Correct Answer: 5 4 3 1 6 8

Note: This Question is unanswered, help us to find answer for this one

310.
Which of the following keyword is used for manually throwing an exception?

try

finally

throw

catch

Answer

Correct Answer: throw

Note: This Question is unanswered, help us to find answer for this one

311.
Which of the following statements are true? (Choose all that apply)

An array has a fixed size.

An ArrayList has a fixed size.

An array allows multiple dimensions.

An array is ordered.

An array is immutable.

An ArrayList is immutable.

Answer

Correct Answer: An array has a fixed size.
An array allows multiple dimensions.
An array is ordered.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

312.
What is the output of the following program? class Upwork{ public static void main(String args[]) { int x , y; x = 10; x++; --x; y = x++; System.out.println(x + " " + y); } }

11 11

10 10

11 10

10 11

Answer

Correct Answer: 11 10

Note: This Question is unanswered, help us to find answer for this one

313.
Which of the following are valid java identifiers? (check any that apply)

A. Up$Work

B. _UpWork

C. true

D. Up.Work

E. Public

F. 1980_s

Up$Work

_UpWork

true

Up.Work

Public

F. 1980_s

Answer

Correct Answer: Up$Work
_UpWork
Public

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

314.
We have a thread defined and running, which method is used to terminate its execution?

interrupt

terminate

stop

quit

Answer

Correct Answer: interrupt

Note: This Question is unanswered, help us to find answer for this one

315.
Which three are valid declarations of a float? float f1 = -343; float f2 = 3.14; float f3 = 0x12345; float f4 = 42e7; float f5 = 2001.0D; float f6 = 2.81F;

1, 2, 4

2, 3, 5

1, 3, 6

2, 4, 6

Answer

Correct Answer: 2, 4, 6

Note: This Question is unanswered, help us to find answer for this one

316.
Which code will terminate the execution of a java program? (check any that apply)

Runtime.exit(0);

System.exit(0);

Runtime.getRuntime().exit(0);

System.getSystem().exit(0);

Answer

Correct Answer: System.exit(0);
Runtime.getRuntime().exit(0);

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

317.
Which one of these lists contains only Java programming language keywords?

class, if, void, long, lnt, continue

goto, instanceof, native, finally, default, throws

try, virtual, throw, final, volatile, transient

strictfp, constant, super, implements, do

byte, break, assert, switch, include

Answer

Correct Answer: goto, instanceof, native, finally, default, throws

Note: This Question is unanswered, help us to find answer for this one

318.
Which of the following are valid for an interface in Java?

Interfaces cannot be instantiated directly.

The interface may not throw a checked exception that is new or broader than the class of any exception thrown in the parent class.

An interface is not required to have any methods.

An interface may not be marked as final.

All top-level interfaces are assumed to have public or default access, and they must include the abstract modifier in their definition.

Answer

Correct Answer: Interfaces cannot be instantiated directly.
An interface is not required to have any methods.
An interface may not be marked as final.
All top-level interfaces are assumed to have public or default access, and they must include the abstract modifier in their definition.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

319.
Which of the following is a method of a wrapper Integer for obtaining hash code for the invoking object?

int hash()

int hashcode()

int hashCode()

Integer hashcode()

Answer

Correct Answer: int hashCode()

Note: This Question is unanswered, help us to find answer for this one

320.
What is the output of the given program? public class Test122 { public static void main(String[] args) { int i = 0; i = i++; i = ++i; i = i++; System.out.println(i); } }

Answer

Correct Answer: 1

Note: This Question is unanswered, help us to find answer for this one

321.
What will be the output of following program? class Upwork { public static void main(String [] args) { int x = 0x80000000; System.out.print(x + " and "); x = x >>> 31; System.out.println(x); } }

-2147483648 and 1

0x80000000 and 0x00000001

-2147483648 and -1

1 and -2147483648

Answer

Correct Answer: -2147483648 and 1

Note: This Question is unanswered, help us to find answer for this one

322.
What will be the output of following code? StringBuilder sb = new StringBuilder("UpWork"); sb.insert(6,"-"); sb.insert(0,"-"); sb.insert(4,"-"); System.out.println(sb);

-U-p-Work

UpWo-r-k-

UpW-o-r-k

-Up-W-ork

-UpW-ork-

-UpWo-rk-

Answer

Correct Answer: -UpW-ork-

Note: This Question is unanswered, help us to find answer for this one

323.
Which of the following statement is true about an anonymous inner class?

It can extend exactly one class and can implement exactly one interface

It can extend exactly one class and can implement multiple interfaces

It can extend exactly one class or can implement exactly one interface

It can implement multiple interfaces regardless of whether it also extends a class

Answer

Correct Answer: It can extend exactly one class or can implement exactly one interface

Note: This Question is unanswered, help us to find answer for this one

324.
Which interface does java.util.Hashtable implement?

java.util.Map

java.util.List

java.util.Hashtable

java.util.Collection

Answer

Correct Answer: java.util.Map

Note: This Question is unanswered, help us to find answer for this one

325.
Which of the following cannot directly cause a thread to stop executing?

Calling the SetPriority() method on a Thread object.

Calling the wait() method on an object.

Calling notify() method on an object.

Calling read method on an InputStream object.

Answer

Correct Answer: Calling notify() method on an object.

Note: This Question is unanswered, help us to find answer for this one

326.
Which of the following statement is an incorrect statement?

String objects are immutable, they cannot be changed.

String objects can point to some other reference of string variable.

StringBuffer calss is used to store string in a buffer for later use.

None of the mentioned

Answer

Correct Answer: StringBuffer calss is used to store string in a buffer for later use.

Note: This Question is unanswered, help us to find answer for this one

327.
You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

public

Private

Protected

Transient

Answer

Correct Answer: Protected

Note: This Question is unanswered, help us to find answer for this one

328.
Which of the following statements regarding abstract classes are true? (check any that apply)

All methods declared in an abstract class must be abstract.

Any subclass (abstract or concrete class) of an abstract class must implement all the methods declared in the parent abstract class.

Any concrete class must implement all the methods of the parent abstract class which are not implemented in the super hierarchy tree.

The abstract class may have method implementation.

Answer

Correct Answer: All methods declared in an abstract class must be abstract.
Any subclass (abstract or concrete class) of an abstract class must implement all the methods declared in the parent abstract class.

Note: This question has more than 1 correct answers

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329.
Is it possible to make entity as read only ?

It is not possible to make entity as read only.

By making @org.hibernate.annotations.Entity(mutable = false).

Declare your fields as "protected" and provide only public getter.

By @ReadOnly annotation at the entity level.

Answer

Correct Answer: By making @org.hibernate.annotations.Entity(mutable = false).
Declare your fields as "protected" and provide only public getter.

Note: This question has more than 1 correct answers

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330.
What will be the output of following code:- List<String>upWork = new ArrayList<>(); upWork.add("jobs"); upWork.add(1, "freelancers"); upWork.add(0, "projects"); upWork.add(1, "earnings"); System.out.println(upWork);

["jobs", "freelancers", "projects", "earnings"]

["freelancers", "projects","jobs", "earnings"]

["earnings", "jobs", "freelancers", "projects"]

["projects", "jobs", "freelancers", "earnings"]

["projects", "earnings", "jobs", "freelancers"]

["freelancers", "jobs", "projects","earnings"]

Answer

Correct Answer: ["projects", "earnings", "jobs", "freelancers"]

Note: This Question is unanswered, help us to find answer for this one

331.
Which annotation helps to define the table where entity will be stored?

@DbTable

@Table

@EntityTable

Answer

Correct Answer: @Table

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332.
Assuming the tag library is in place and the tag handler is correct, which of the following is the correct way to use a custom tag in a JSP page?

yourLibrary=»whatColorlslt» color=»red»/>

<yourLibrary:whatColorlslt color=»red»/>

<yourLibrary.whatColorlslt color=»red»/>

Answer

Correct Answer: <yourLibrary:whatColorlslt color=»red»/>

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333.
What will be the output of following program? class Upwork { public static void main(String args[]) { try { return; } finally { System.out.println("Finally"); } } }

Finally

Compilation fails

The code runs with no output

An exception is thrown at runtime

Answer

Correct Answer: Finally

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334.
What will be the output of following code? String string = "UpWork"; System.out.println(string.indexOf("o",5))?

"-2"

"-1"

"0"

"1"

"2"

"3"

"4"

"5"

Answer

Correct Answer: "-1"

Note: This Question is unanswered, help us to find answer for this one

335.
What is required for Message-Driven Bean?

@MessageDriven annotation must be used

Class must be public

Must contain any non-default constructor

Must implement MessageListener interface

Answer

Correct Answer: @MessageDriven annotation must be used
Class must be public

Note: This question has more than 1 correct answers

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336.
Which of the following are known as runtime exceptions?

ArithmeticException

ClassCastException

NoSuchMethodException

ClassNotFoundException

Answer

Correct Answer: ArithmeticException
ClassCastException

Note: This question has more than 1 correct answers

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337.
Which three are valid declarations of a char? char c1 = 064770; char c2 = 'face'; char c3 = 0xbeef; char c4 = \u0022; char c5 = '\iface'; char c6 = '\uface';

1, 2, 4

1, 3, 6

3, 5, 6

2, 4, 6

Answer

Correct Answer: 1, 3, 6

Note: This Question is unanswered, help us to find answer for this one

338.
What is the output of the given program? public class Test115 { { System.out.print("_init"); } static { System.out.print("_static"); } public static void main(String[] args) { System.out.print("_main"); } }

_static_main

_init_main

_static_init_main

_init_static_main

Answer

Correct Answer: _static_main

Note: This Question is unanswered, help us to find answer for this one

339.
Which of the following programs will compile, run as a console application, and print the corresponding text to System.out?

public class Test79a { public static void main(String[] args) throws Exception { System.out.println("Hello, 79a!"); } }

public class Test79b { final public static void main(String[] args) throws Exception { System.out.println("Hello, 79b!"); } }

public class Test79c { public static void main(String[] arguments) throws Exception { System.out.println("Hello, 79c!"); } }

public class Test79d { public static void main(String... args) throws Exception { System.out.println("Hello, 79d!"); } }

Answer

Correct Answer: public class Test79a { public static void main(String[] args) throws Exception { System.out.println("Hello, 79a!"); } }
public class Test79b { final public static void main(String[] args) throws Exception { System.out.println("Hello, 79b!"); } }
public class Test79c { public static void main(String[] arguments) throws Exception { System.out.println("Hello, 79c!"); } }
public class Test79d { public static void main(String... args) throws Exception { System.out.println("Hello, 79d!"); } }

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

340.
Which will legally declare, construct, and initialize an array?

int [] myList = {"1", "2", "3"};

int [] myList = (5, 8, 2);

int myList [] [] = {4,9,7,0};

int myList [] = {4, 3, 7};

Answer

Correct Answer: int myList [] = {4, 3, 7};

Note: This Question is unanswered, help us to find answer for this one

341.
A method can be defined as native to: (choose all that apply)

Overcome the limitations of the private scope of a method.

Get to access hardware that Java does not know about.

Write optimized code for performance in a language such as C/C++.

Define a new data type such as an unsigned integer.

Answer

Correct Answer: Get to access hardware that Java does not know about.
Write optimized code for performance in a language such as C/C++.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

342.
What will be the output of the following code? class ExceptionTest{ public static void main(String[] args){ try{ System.out.print("1"); throw new Exception(); } catch(Exception ex){ System.out.print("2"); } finally{ System.out.print("3"); } } }

Code will not compile

132

123

Answer

Correct Answer: 123

Note: This Question is unanswered, help us to find answer for this one

343.
Which of the following are ignored by serialization? (Choose all that apply)

Static fields

Transient fields

Fields of the base class which are not serializable

Member variables of a serializable class

Answer

Correct Answer: Static fields
Transient fields

Note: This question has more than 1 correct answers

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344.
What is the output of the following program? class Upwork { public static void main(String args[]) { try { int a[]={1,2,3,4,5}; for(int i=0;i<7;i++) System.out.println(a[i]); } catch(ArrayIndexOutOfBoundsException e) { System.out.println("0"); } } }

12345

123450

1234500

Compilation Error

Answer

Correct Answer: 123450

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345.
Which method contains the body of the thread?

run()

start()

stop()

main()

Answer

Correct Answer: run()

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346.
What will be the output of the following code? int three = 3; String four = "4"; System.out.println(1 + 2 + three + four);

"10"

"1234"

"334"

"127"

"64"

Answer

Correct Answer: "64"

Note: This Question is unanswered, help us to find answer for this one

347.
Which of these packages contain all the Java's built in exceptions?

java.io

java.util

java.lang

java.net

Answer

Correct Answer: java.lang

Note: This Question is unanswered, help us to find answer for this one

348.
Which of the following methods waits for the thread to terminate?

Sleep()

isAlive()

join()

Stop()

Answer

Correct Answer: join()

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349.
What is the output of the following program?

Class Upwork{

Public static void main(string args[])

{

Byte x = 64;

Int I;

Byte y;

i = x << 2

y = (byte) (x << 2)

system.out.print(I + “” + y);

}

}

0 64

64 0

0 256

256 0

Answer

Correct Answer: 256 0

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350.
Which type(s) cannot be used as generics?

primitives

enum types

Inner classes

Answer

Correct Answer: primitives

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351.
What is the purpose of EL(Expression Language) in Java Web Application?

Simplify calculation and writing logic in servlet

Dynamically set/get JavaBean component data

Invoke JavaBean methods

Answer

Correct Answer: Dynamically set/get JavaBean component data
Invoke JavaBean methods

Note: This question has more than 1 correct answers

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352. What will be the output of following program? class Upwork { public static void main(String args[]) { int x=100; double y=100.1; boolean b= (x=y); System.out.println(b); } }

true

false

compilation fails

An exception is thrown at runtime

Answer

Correct Answer: compilation fails

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353.
Which of the following are true?

Java classes support single inheritance, and multiple inheritance.

The following compiles correctly. public class UpWork { private int freelancers; public intgetFreelancers() { return freelancers; } public void setFreelancers(int freelancers) { this.freelancers = freelancers; } } public class TalentCloud extends UpWork { private void work() { System.out.println("There are "+freelancers+" working"); } }

The following two class definitions are equivalent. public class UpWork { } public class UpWork extends java.lang.Object { }

The following compiles. public class UpWork { private int freelancers; public UpWork (int freelancers) { System.out.println("UpWork created"); super(); } }

The following classes compile. public class UpWork { public UpWork(int freelancers) { } } public class Developer extends UpWork { }

Answer

Correct Answer: The following classes compile. public class UpWork { public UpWork(int freelancers) { } } public class Developer extends UpWork { }

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354.
What is the purpose java.exe?

Execute compiled bytecode on jvm.

Compile .java files into bytecode

Compile .java files and run them

Answer

Correct Answer: Compile .java files and run them

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355.
Which method is used to pause thread execution for X seconds, so it might resume its

execution after that?

wait

sleep

pause

rest

Answer

Correct Answer: sleep

Note: This Question is unanswered, help us to find answer for this one

356.
We are writing an application to manage auto parts. Auto part has String key as id.

Which collection will be the most efficient, if we are going to search parts by id?

ArrayList

LinkedList

HashMap

Answer

Correct Answer: HashMap

Note: This Question is unanswered, help us to find answer for this one

357.
Which of the following statements regarding Java classes is true?

A class is made of objects.

A class provides the behavior and structure to create objects.

A class supplies or delivers objects to the rest of the application.

A class is a collection of objects.

Answer

Correct Answer: A class provides the behavior and structure to create objects.

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358.
Which of the following classes might be considered encapsulated: class Jason{ public

int age; public String name; } class Sam{ private int age; private String name; public

void setAge(int age){ this.age = age; } public intgetAge(){ return age; } public String

getName(){ return name; } public void setName(String name){ this.name = name; } }

Jason class is well encapsulated. User has direct access.

Sam class is encapsulated.

Both classes are encapsulated, just different form.

Answer

Correct Answer: Sam class is encapsulated.

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359.
Which of the following will compile without any error?

public abstract class UpWork { }

public class UpWork { public abstract void work(); }

public abstract class UpWork { public abstract void work() {} }

public abstract class UpWork { public abstract int jobs() { return 10; } }

public final abstract class UpWork { }

public abstract class UpWork { public abstract final void work(); }

Answer

Correct Answer: public abstract class UpWork { }

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360.
Say we have java entity with date field. For example: @Entity class User{ private Date

joinDate; public Date getJoinDate(){ return joinDate; } public void setJoinDate(Date

joinDate){ this.joinDate = joinDate; } } What JPA annotation will help us specify date

format that will be used in database?

@Temporal

@DateFormat

@DateConvert

Answer

Correct Answer: @Temporal

Note: This Question is unanswered, help us to find answer for this one

361.
Will the following code compile? public interface Repository{ void save(Object data); }

public abstract class RepositoryImpl implements Repository{ }

Compilation will fail, abstract class can not implement an interface

No compilation error

Compilation fails, class can't be instantiated

None of the above

Answer

Correct Answer: No compilation error

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362.
Is it possible to get mapping information from parent class that entity extends?

Yes, @InheritAnnotations is used

Yes, @MappedSuperclass annotation is used.

No, we can't persist inherited classes, so we define annotations in current entity class

Answer

Correct Answer: Yes, @MappedSuperclass annotation is used.

Note: This Question is unanswered, help us to find answer for this one

363.
What kinds of properties can a JavaBean have?

indexed properties

bound properties

constrained properties

limited properties

Answer

Correct Answer: indexed properties
bound properties
constrained properties

Note: This question has more than 1 correct answers

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364.
Which class method will be called under lines //Line 1 and //Line 2 in the following

code? class Rectangle { double width, length; Rectangle(double width, double length) {

this.width = width; this.length = length; } double getArea() { double area = width * length;

return area; } void show() { System.out.println(""The width and length are: "" + width + "",

"" + length); System.out.println(""The area is: "" + getArea()); } } class Square extends

Rectangle { double width, length; Square(double width) { super(width, width); this.width

= width; } double getArea() { double area = width * width; return area; } void show() {

System.out.println(""The width is: "" + width); System.out.println(""The area is: "" +

getArea()); } public static void main(String[] args) { Rectangle shape1 = new

Rectangle(5, 2); Square shape2 = new Square(5); shape1.show(); // Line 1

shape2.show(); // Line 2 } }

shape1.show(); // Line 1 - Rectangle Class Method Call shape2.show(); // Line 2 - Square Class Method Call

shape1.show(); // Line 1 - Square Class Method Call shape2.show(); // Line 2 -Square Class Method Call

shape1.show(); // Line 1 - Rectangle Class Method Call shape2.show(); // Line 2 - Rectangle Class Method Call

The code will throw a runtime error.

Answer

Correct Answer: shape1.show(); // Line 1 - Square Class Method Call shape2.show(); // Line 2 -Square Class Method Call

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365.
Which tool has interface to trigger managed beans?

jmonitor.exe

jconsole.exe

java.exe

Answer

Correct Answer: java.exe

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366.
Which statement is true about the given program? public class Test24 { public static

void main(String[] args) { byte a = 20; byte b = 4; byte c = a + b; System.out.println(c); }

}

It does not compile (compiler error).

It compiles, but does not run (throws an exception during run-time).

It compiles, runs, outputs 24, then exits.

It compiles, runs, but never exits.

Answer

Correct Answer: It does not compile (compiler error).

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367.
What is the difference between a try-catch block and a try-catch-finally block?

try-catch contains code to execute if an error occurs or not, while try-catch-finally works the same way as try-catch block with the addition of a set of code that willexecute whether an error occurs or not.

try-catch contains code to execute whether an occurs or not, try-catch-finally contains code to execute only if an error occurs

Same thing, different names

Answer

Correct Answer: try-catch contains code to execute if an error occurs or not, while try-catch-finally works the same way as try-catch block with the addition of a set of code that willexecute whether an error occurs or not.

Note: This Question is unanswered, help us to find answer for this one

368.
Which is the best place to store business logic and look of the page?

JSP page must contain both business logic and display logic.

Servlet should contain business logic and JSP page should contain only display logic.

Servlet must contain both display logic and business logic.

Answer

Correct Answer: Servlet must contain both display logic and business logic.

Note: This Question is unanswered, help us to find answer for this one

369.
The code below is supposed to find the maximum value of array

{6,15,2,5,8,14,10,16,11,17,13,7,1,18,3,4,9,12}. How can the code be substantially

improved, if at all? public static intmaxOfArray(int[] a) { int length = a.length; if(length<1)

throw new NoSuchElementException("Not at least one integer in array"); while (length >

1) { int k = length; for(inti = 0; i< length/2; i++) { k--; if(a[i]>a[k]) { int j = a[i]; a[i] = a[k];

a[k] = j; } } length /=2; } return a[0]; }

Reduce the problem to ceil(length/2) instead of length/2 (and handling special case of length==1)

Reduce the problem to ceil(length/2) instead of length/2

This code has no errors and cannot be substantially improved in any way.

* (must fix if (a[i]>a[k]) to if (a[i]<a[k]))

Answer

Correct Answer:

* (must fix if (a[i]>a[k]) to if (a[i]<a[k]))

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370.
How can the string "1 2 3 3 4 4 5 1" be added to an ArrayList where each number

separated by a space is added as a separate list item, and the list cannot have

duplicates?

Split the String using split(" ") and then loop the return String[] array, adding each to the ArrayList.

Check if the ArrayList already contains the same string using the contains() method.

Split the String using split(" ") and then loop the return String[]. It can be directly assigned to the ArrayList since the return type of the split() method is an Array.

Answer

Correct Answer: Check if the ArrayList already contains the same string using the contains() method.

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371.
The method foo() defined in the class Quiz has the following signature: public static

double foo(double f) What can be said about foo()?

It is a class method.

It is an instance variable.

It is a class attribute.

Answer

Correct Answer: It is a class method.

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372.
What will be the output of the following code? public class Test extends Thread { private
int value; public Test(int value) { this.value = value; } public static void main(String[]
args) { Test t1 = new Test(1); Test t2 = new Test(2); Test t3 = new Test(3); t1.start();
t2.start(); t3.start(); } @Override public void run() { for (inti = 0; i< 3; i++) {
System.out.println("Thread " + value + " with value " + i + " Started"); try { sleep(100); }
catch (InterruptedException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex); }
System.out.println("Thread " + value + " with value " + i + " Completed"); } } }

Thread 1 with value 1 Started Thread 2 with value 1 Started Thread 3 with value 1 Started Thread 1 with value 1 Completed Thread 2 with value 1 Completed Thread 3 with value 1 Completed Thread 1 with value 2 Started Thread 2 with value 2 Started Thread 3 with value 2 Started Thread 1 with value 2 Completed Thread 2 with value 2 Completed Thread 3 with value 2 Completed Thread 1 with value 3 Started Thread 2 with value 3 Started Thread 3 with value 3 Started Thread 1 with value 3 Completed Thread 2 with value 3 Completed Thread 3 with value 3 Completed

Thread 1 with value 1 Started Thread 1 with value 1 Completed Thread 2 with value 1 Started Thread 2 with value 1 Completed Thread 3 with value 1 Started Thread 3 with value 1 Completed Thread 1 with value 2 Started Thread 1 with value 2 Completed Thread 2 with value 2 Started Thread 2 with value 2 Completed Thread 3 with value 2 Started Thread 3 with value 2 Completed Thread 1 with value 3 Started Thread 1 with value 3 Completed Thread 2 with value 3 Started Thread 2 with value 3 Completed Thread 3 with value 3 Started Thread 3 with value 3 Completed

Thread 1 with value 1 Started Thread 2 with value 1 Started Thread 3 with value 1 Started Thread 1 with value 2 Started Thread 2 with value 2 Started Thread 3 with value 2 Started Thread 1 with value 3 Started Thread 2 with value 3 Started Thread 3 with value 3 Started Thread 1 with value 1 Completed Thread 2 with value 1 Completed Thread 3 with value 1 Completed Thread 1 with value 2 Completed Thread 2 with value 2 Completed Thread 3 with value 2 Completed Thread 1 with value 3 Completed Thread 2 with value 3 Completed Thread 3 with value 3 Completed

The output cannot be predicted.

Answer

Correct Answer: The output cannot be predicted.

Note: This Question is unanswered, help us to find answer for this one

373.
Which is the correct way to make the Jframevisiable always on top of other windows ?

It is not possible to make the Jframe to make it visiable always on top of other windows.

Jframe.alwaysOnTop(true);

Jframe.setAlwaysOnTop(true);

Jframe.minimizeOtherWindow(true);

Answer

Correct Answer: Jframe.setAlwaysOnTop(true);

Note: This Question is unanswered, help us to find answer for this one

374.
Which is a proper way to declare and throw exception of class XYException?

class XYException extends Exception {} ... throw new XYException();

class XYException implements Exception {} ... throw new XYException();

class XYException extends Exception {} ... throw new Exception(""XYException"");

class XYException implements Exception {} ... throw new Exception(""XYException){};

Answer

Correct Answer: class XYException extends Exception {} ... throw new XYException();

Note: This Question is unanswered, help us to find answer for this one

375.
What will be the output of the following code? public double beraknaOmkrets() {

DecimalFormat f = new DecimalFormat("##.0"); intradie = 3; double omkrets = 0;

omkrets = radie23.14; return f.format(omkrets).toString; }

It returns the value generated by the statement "f.format(omkrets).toString;".

It compiles successfully but generates run time error "incompatible return type".

It returns a compile time error.

None of these.

Answer

Correct Answer: It returns a compile time error.

Note: This Question is unanswered, help us to find answer for this one

376.
What is the numerical range of a char?

-128 to 127

-(215) to (215) - 1

0 to 32767

0 to 65535

Answer

Correct Answer: 0 to 65535

Note: This Question is unanswered, help us to find answer for this one

377.
Is it possible to execute different threads in a user defined sequence in Java?

The thread sequence cannot be defined.

It's possible using the "join" method.

t's possible using the "yield" method.

It's possible using the "notify" method.

Answer

Correct Answer: It's possible using the "notify" method.

Note: This Question is unanswered, help us to find answer for this one

378.
What is the O(n) run-time of the following function? static int fib(int n){ if (n <=

2) return 1; else return fib(n-1) + fib(n-2) }

O(2^n)

O(1)

O(2^n-1) + O(2^n-2)

Answer

Correct Answer: O(2^n)

Note: This Question is unanswered, help us to find answer for this one

379.
Can one class in java extend multiple classes?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

380.
Which is the correct method to add button listener.

jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEventevt) { } });

jButton1.addActionListener(java.awt.event.ActionListener() { public void actionPerformed(new java.awt.event.ActionEventevt) { } });

jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(new java.awt.event.ActionEventevt) { } });

jButton1.addActionListener(java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEventevt) { } });

Answer

Correct Answer: jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEventevt) { } });

Note: This Question is unanswered, help us to find answer for this one

381.
Which annotation makes a basic class persistent?

@Persis

@Entity

@Savable

Answer

Correct Answer: @Entity

Note: This Question is unanswered, help us to find answer for this one

382.
Which of the following is the correct way in Java to show that the class Developer inherits from

the parent class Freelancer?

public class Developer : Freelancer { // Methods and variables defined here }

public class Developer (Freelancer) { // Methods and variables defined here }

public class Developer extends Freelancer { // Methods and variables defined here }

public abstract class Developer (Freelancer) { // Methods and variables defined here }

Answer

Correct Answer: public class Developer extends Freelancer { // Methods and variables defined here }

Note: This Question is unanswered, help us to find answer for this one

383.
Which of these is a process of converting a primitive data type into object?

Type wrapping

Type conversion

Type casting

None of the above

Answer

Correct Answer: None of the above

Note: This Question is unanswered, help us to find answer for this one

384.
What is the output of the given program? public class Test109 { public static void main(String[] args) { System.out.println( 10/3 > 3 ? "MORE" : 10/4 < 3 ? "LESS" : "MORE" ); } }

LESS

MORELESS

LESSMORE

Answer

Correct Answer: LESS

Note: This Question is unanswered, help us to find answer for this one

385.
Which of the following are among the rules for defining abstract methods?

Abstract methods may be defined in any class.

An abstract method must not provide a method body/implementation in the abstract class for which it is declared.

Implementing an abstract method in a subclass follows the same rules for overriding a method.

An abstract method that extends another abstract method inherits all of its abstract methods as its own abstract methods.

The super() call must be used as the first statement of the abstract method.

Answer

Correct Answer: An abstract method must not provide a method body/implementation in the abstract class for which it is declared.

Note: This Question is unanswered, help us to find answer for this one

386.
Which is the valid declarations within an interface definition?

public double methoda();

public final double methoda();

static void methoda(double d1);

protected void methoda(double d1);

Answer

Correct Answer: public double methoda();

Note: This Question is unanswered, help us to find answer for this one

387.
Which method is used to wait for thread to fully complete its execution?

wait

join

waitComplete

meet

Answer

Correct Answer: join

Note: This Question is unanswered, help us to find answer for this one

388.
What allows the programmer to destroy an object x?

x.delete()

x.finalize()

x.remove()

Only the garbage collection system can destroy an object

Answer

Correct Answer: Only the garbage collection system can destroy an object

Note: This Question is unanswered, help us to find answer for this one

389.
Which statement is true about a static nested class?

You must have a reference to an instance of the enclosing class in order to instantiate it.

It does not have access to non static members of the enclosing class.

It's variables and methods must be static.

It must extend the enclosing class.

Answer

Correct Answer: It does not have access to non static members of the enclosing class.

Note: This Question is unanswered, help us to find answer for this one

390.
Which collection class allows you to associate its elements with key values, and allows you to retrieve objects in FIFO (first-in, first-out) sequence?

java.util.ArrayList

java.util.LinkedHashMap

java.util.HashMap

java.util.TreeMap

Answer

Correct Answer: java.util.LinkedHashMap

Note: This Question is unanswered, help us to find answer for this one

391.
What is the prototype of the default constructor for following class? public class Test { }

Test( )

Test(void)

public Test( )

public Test(void)

Answer

Correct Answer: public Test( )

Note: This Question is unanswered, help us to find answer for this one

392.
What will be the output of following code: class Printer extends Thread{ private int max = 0; public Printer(int max){ this.max = max; } public void run() { for(int i=1; i<=max; i++){ System.out.println(i); } } public static void main(String[] args){ Printer printer1 = new Printer(3); Printer printer2 = new Printer(2); printer1.start(); printer2.start(); } }

1 2 1 2 3

1 2 3 1 2

We can't be sure about exact output

Answer

Correct Answer: 1 2 1 2 3

Note: This Question is unanswered, help us to find answer for this one

393.
What modifers are implicitly applied to all interface methods? (Choose all that apply)

default

abstract

void

static

public

protected

final

Answer

Correct Answer: static

Note: This Question is unanswered, help us to find answer for this one

394.
Which of the following class level (non local) variable declarations will not compile?

protected int a;

transient int b=3;

private synchronized int e;

volatile int d

Answer

Correct Answer: private synchronized int e;

Note: This Question is unanswered, help us to find answer for this one

395.
Which of these method of Thread class is used to find out the priority given to a thread?

get()

ThreadPriority()

getPriority()

getThreadPriority()

Answer

Correct Answer: getPriority()

Note: This Question is unanswered, help us to find answer for this one

396.
What is the most restrictive access modifier that will allow members of one class to have access to members of another class in the same package?

public

protected

abstract

synchronized

default access

Answer

Correct Answer: default access

Note: This Question is unanswered, help us to find answer for this one

397.
Which of the following is not a valid collection class?

ArrayList

HashMap

LinkedinList

HashList

Answer

Correct Answer: HashList

Note: This Question is unanswered, help us to find answer for this one

398.
Consider the below statement:- String string = "UpWork"; Which of the following will output "o"?

System.out.println(string.substring(3));

System.out.println(string.substring(4));

System.out.println(string.substring(string.indexOf('o')));

System.out.println(string.substring(3, 4));

System.out.println(string.substring(3, 6));

System.out.println(string.substring(3,3));

System.out.println(string.substring(3,2));

System.out.println(string.substring(3,7));

Answer

Correct Answer: System.out.println(string.substring(3, 4));

Note: This Question is unanswered, help us to find answer for this one

399.
Which annotation is used to prevent entity field from being saved into the database?

@Skip

@Transient

@Ignore

Answer

Correct Answer: @Transient

Note: This Question is unanswered, help us to find answer for this one

400.
Which of the following can be used to bind HTML form parameters into Java EE web service method?

@PathParam

@FormParam

@WebParam

Answer

Correct Answer: @FormParam

Note: This Question is unanswered, help us to find answer for this one

401.
What will be the output of following program? public class UpWork { private String freelancer; private boolean busy: public static void main(String[] args) { UpWork upw = new UpWork(); System.out.print("Busy= " + upw.busy); System.out.print(", Freelancer = " + upw.freelancer); } }

Line 6 generates a compiler error.

Line 7 generates a compiler error.

There is no output.

Busy = false, Freelancer = null

Busy = false, Freelancer =

Busy = null, Freelancer = null

Answer

Correct Answer: Busy = false, Freelancer = null

Note: This Question is unanswered, help us to find answer for this one

402.
Which one is a valid declaration of a boolean?

boolean b1 = 0;

boolean b2 = 'false';

boolean b3 = false;

boolean b4 = Boolean.false();

boolean b5 = no;

Answer

Correct Answer: boolean b3 = false;

Note: This Question is unanswered, help us to find answer for this one

403.
What is usually inside the WEB-INF folder of a typical Java Web Application?

Compiled classes

Compiled and obfuscated javascript libraries

Jar libraries

Deployment descriptors

HTML and JSP pages

Answer

Correct Answer: Compiled classes
Jar libraries
Deployment descriptors

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

404.
What is the output of the given code? final byte a = 12; final byte b = 5; System.out.println(a&b);

Answer

Correct Answer: 4

Note: This Question is unanswered, help us to find answer for this one

405.
Is it possible to ignore a field or fields during persistence ?

It is not possible to ignore field or fields during persisence in JPA.

By marking field or field @Transient it will ignore at the time of persistence.

By marking field or field @ReadOnly it will ignore at the time of persistence.

By marking field or field @Volatile it will ignore at the time of persistence.

Answer

Correct Answer: By marking field or field @Transient it will ignore at the time of persistence.

Note: This Question is unanswered, help us to find answer for this one

406.
Which of the following can be used to inject URI query parameters into a Java method?

@QueryParam

@PathParam

@Param

Answer

Correct Answer: @QueryParam

Note: This Question is unanswered, help us to find answer for this one

407.
Which method is used in every Java program?

System.out.println()

main()

type()

System.out.print()

Answer

Correct Answer: main()

Note: This Question is unanswered, help us to find answer for this one

408.
Which keyword is used for implementing an interface in a class?

extends

implements

uses

Answer

Correct Answer: implements

Note: This Question is unanswered, help us to find answer for this one

409.
What is the internal implementation of ArrayList in Java?

ArrayList consists of nodes connected to each other.

ArrayList internally uses array object to add the elements.

ArrayList has dictionary inside which keys are numbers.

Answer

Correct Answer: ArrayList internally uses array object to add the elements.

Note: This Question is unanswered, help us to find answer for this one

410.
What is the result of the following code? public class JQ { public static void main(String[] args) { f(); } private static void f() { f(); } }

It does not compile, because f is defined after/later than called/used.

It compiles, but throws java.lang.StackOverflowError during run-time.

It compiles, runs without issues, but never ends, because there's an endless loop.

It does not compile, because recursion is not allowed for static methods.

Answer

Correct Answer: It compiles, runs without issues, but never ends, because there's an endless loop.

Note: This Question is unanswered, help us to find answer for this one

411.
What is the output of the given console application? public class Test34 { public static void main(String[] args) { int a = 2; switch(a) { default: System.out.print("_default"); case 0: System.out.print("_ZERO"); case 1: System.out.print("_ONE"); } } }

_default

_default_ZERO_ONE

_ZERO_ONE_default

_ZERO_ONE_default_ZERO_ONE

Answer

Correct Answer: _default_ZERO_ONE

Note: This Question is unanswered, help us to find answer for this one

412.
Which annotation defines unique identifier for a JPA entity?

@Identifier

@Id

@Sequence

Answer

Correct Answer: @Id

Note: This Question is unanswered, help us to find answer for this one

413.
Which of the following is the correct way to run a thread?

Thread thread = new MyThread(); thread.run();

Thread thread = new MyThread(); thread.submit();

Thread thread = new MyThread(); thread.start();

Thread thread = new MyThread(); thread.execute();

Answer

Correct Answer: Thread thread = new MyThread(); thread.start();

Note: This Question is unanswered, help us to find answer for this one

414.
Which JDK tool converts java file to bytecode?

bytecodemapper.exe

javac.exe

javaconvert.exe

Answer

Correct Answer: javac.exe

Note: This Question is unanswered, help us to find answer for this one

415.
What will be the output of following code: for(int i=1; i<10; i++){ System.out.print(" "+i); }

1 2 3 4 5 6 7 8 9 10

0 1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9

Answer

Correct Answer: 1 2 3 4 5 6 7 8 9

Note: This Question is unanswered, help us to find answer for this one

416.
Which of the following classes ease implementation of JavaBean properties?

PropertyChangeSupport

VetoableChangeSupport

CompositeDataSupport

DescriptorSupport

Answer

Correct Answer: PropertyChangeSupport
VetoableChangeSupport

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

417.
What is the output of the given console application? public class Test18 { public static

void main(String[] args) { for (int i=0; i<7; i++) { if (i==4) continue; System.out.print(i); } }

}

0123

012356

0123567

01234567

Answer

Correct Answer: 012356

Note: This Question is unanswered, help us to find answer for this one

418.
What is the output of the given program? public class Test118 extends _Test118 { {

System.out.print("_INIT"); } static { System.out.print("_STATIC"); } Test118() {

System.out.print("_CONST"); } public static void main(String[] args) {

System.out.print("_MAIN"); new Test118(); } } class _Test118 { _Test118() {

System.out.print("_BASE"); } }

_STATIC_MAIN_BASE_INIT_CONST

_INIT_STATIC_MAIN_BASE_CONST

Answer

Correct Answer: _STATIC_MAIN_BASE_INIT_CONST
_STATIC_MAIN_BASE_INIT_CONST

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

419.
What is the output of the given program? public class Test102 { public static void

main(String[] args) { String s = "string102"; String t = "string" + (9 * s.length() + 3); String

u = "string" + 102; System.out.println( (s==t) + "-" + (s==u) ); } }

false-false

false-true

true-false

true-true

Answer

Correct Answer: false-true

Note: This Question is unanswered, help us to find answer for this one

420.
Which term refers to an application's ability to execute concurrent processes in a timely

manner?

liveness

responsiveness

robustness

consistency

Answer

Correct Answer: liveness

Note: This Question is unanswered, help us to find answer for this one

421.
Which Java EE framework is used to create REST web services?

JAX-WS

JAX-RS

JRest

Answer

Correct Answer: JAX-RS

Note: This Question is unanswered, help us to find answer for this one

422.
Which layout class would you use to lay out components from left to right?

FlowLayout

GridLayout

SpacedLayout

DirLayout

Answer

Correct Answer: FlowLayout

Note: This Question is unanswered, help us to find answer for this one

423.
What is the output of the given program? import java.io.*; public class Test86 { public

static void main(String[] args) throws ClassNotFoundException, IOException {

ByteArrayOutputStream bOut = new ByteArrayOutputStream(); ObjectOutputStream

objStrm = new ObjectOutputStream(bOut); Beta b = new Beta() {{ a=2; b=3; }};

objStrm.writeObject(b); ObjectInputStream objInStrm = new ObjectInputStream(new

ByteArrayInputStream(bOut.toByteArray()));

System.out.println(objInStrm.readObject().toString()); } } class Alpha { public int a; public

transient int b; } class Beta extends Alpha implements Serializable { public String

toString() { return String.valueOf(a) + String.valueOf(b); } }

Answer

Correct Answer: 00

Note: This Question is unanswered, help us to find answer for this one

424.
What's the output of the following code: int a = 5; while(a > 3){ System.out.print(a--); }

4 3

5 4 3

5 4

Answer

Correct Answer: 5 4

Note: This Question is unanswered, help us to find answer for this one

425.
What is the output of the given program? import java.util.Properties; public class Test72

{ public static void main(String[] args) { Properties p = new Properties(); p.put("grade",

"master"); Properties p2 = new Properties(p); System.out.println(p2.get("grade") + " : " +

p2.getProperty("grade")); } }

master : master

null : master

master : null

grade : master

Answer

Correct Answer: null : master

Note: This Question is unanswered, help us to find answer for this one

426.
What will be the output of following code:- int a = 5; int b = a; a*=2; b+=1;

System.out.println(a); System.out.println(b);

10 11

10 6

25 11

Answer

Correct Answer: 10 6

Note: This Question is unanswered, help us to find answer for this one

427.
What is the output of the given program? public class Test128 { public static void

main(String[] args) { A a = new A2(); B b = new B2(); System.out.println(a.a + b.b); } }

class A { int a = 1; } class A2 extends A { int a = 2; } class B { public int b = 1; } class B2

extends B { public int b = 2; }

Answer

Correct Answer: 2

Note: This Question is unanswered, help us to find answer for this one

428.
Which statement about the given code is true? import java.io.IOException; public class

Test110 { public static void main(String[] args) { throwEx(new

IOException("unchecked")); } static void throwEx(Exception e) {

Test110.<RuntimeException> _throw(e); } static <E extends Exception> void

_throw(Exception e) throws E { throw (E) e; } }

The code does not compile, because a checked exception is thrown, but not declared in the throwEx() and main() methods.

Exception instance of IOException is created as unchecked in the main() method.

The code compiles, runs and throws an IOException.

The code compiles and runs without throwing an exception.

Answer

Correct Answer: Exception instance of IOException is created as unchecked in the main() method.

Note: This Question is unanswered, help us to find answer for this one

429.
A class has two method implementations that will cause a compiler error. What is the reason for the compiler error? public static void flexiPrint(Object... data){} public static void flexiPrint(Object[] data){}

"..." is not valid Java syntax.

Two methods with the same name cannot be in the same class.

The argument "Object..." is identical to argument Object[].

All of the above

Answer

Correct Answer: The argument "Object..." is identical to argument Object[].

Note: This Question is unanswered, help us to find answer for this one

430.
Which code snippet below generates random numbers between 0 and 0.5?

Random generator = new Random(); double num = generator.nextDouble();

Random generator = new Random(); double num = generator.nextDouble() * 0.5;

Random generator = new Random(); double num = generator.nextDouble()/2;

Answer

Correct Answer: Random generator = new Random(); double num = generator.nextDouble() * 0.5;
Random generator = new Random(); double num = generator.nextDouble()/2;

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

431.
Which of the following are legal variable types in java?

int

byte

String

Real

Answer

Correct Answer: int
byte
String

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

432.
Consider below code: class Ex1{ public static void main(String[] args) { int a[] = { 1,2,053,4}; int b[][] = { {1,2,4} , {2,2,1},{0,43,2}}; System.out.print(a[3]==b[0][2] ); System.out.print(" " + (a[2]==b[2][1])); } } What is the result?

true false

false false

false true

true true

Compilation fails

Answer

Correct Answer: true true

Note: This Question is unanswered, help us to find answer for this one

433.
What is the term for the scenario when the compiler infers the type of a wildcard?

wildcard

wildcard capture

type inference

wildcard inference

Answer

Correct Answer: wildcard capture

Note: This Question is unanswered, help us to find answer for this one

434.
What is the term to describe a situation where two or more threads are blocked forever, waiting for each other?

deadlock

starvation

livelock

liveness

Answer

Correct Answer: deadlock

Note: This Question is unanswered, help us to find answer for this one

435.
Which of the following is the name of the cookie used by Servlet Containers to maintain session information?

SESSIONID

SERVLETID

JSESSIONID

CONTAINERID

Answer

Correct Answer: SERVLETID
JSESSIONID

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

436.
When a servlet accepts call from a client, it receives:

Two objects - ServletRequest&ServletResponse

ServletRequest object

ServletResponse object

ServletRequest or ServletResponse

ServletConfig object

Answer

Correct Answer: Two objects - ServletRequest&ServletResponse

Note: This Question is unanswered, help us to find answer for this one

437.
When a serializable object is passed to a remote method, it is:

Copied wholly to the other side

Lost somewhere

Deserialized wholly to the server side

Copied partially to the other side

Copied to the server

Answer

Correct Answer: Copied to the server

Note: This Question is unanswered, help us to find answer for this one

438.
Which is the correct way to create a daemon/background thread in Java?

Thread t = new Thread(); t.start(); t.setDaemon();

Thread t = new Thread(); t.start(); t.setDaemon(true);

Thread t = new Thread(); t.setDaemon(); t.start();

Thread t = new Thread(); t.setDaemon(true); t.start();

Answer

Correct Answer: Thread t = new Thread(); t.setDaemon(true); t.start();

Note: This Question is unanswered, help us to find answer for this one

439.
Distributed Computing in Java means:

Objects on different machines working together

Methods on different machines working together

Methods on same machines working together

Objects on same machines working together

Classes on different machines working together

Answer

Correct Answer: Objects on different machines working together

Note: This Question is unanswered, help us to find answer for this one

440.
What will be the output, if the following program is run? public class Test8 { public static void main(String[] args) { System.out.println(Math.sqrt(-4)); } }

null

NaN

-2.0

Answer

Correct Answer: NaN

Note: This Question is unanswered, help us to find answer for this one

441.
What is the output of the given console application? public class Test28 { public static void main(String[] args) { Doc.test(); } } class Doc { public String summary() { return ""doc#""; } public static void test() { Doc[] docs = new Doc[] {new Doc(), new Spec()}; for (Doc d: docs) System.out.print(d.summary()); } } class Spec extends Doc { public String summary() { return ""spc#""; } }

doc#doc#

doc#spc#

spc#doc#

spc#spc#

Answer

Correct Answer: doc#doc#

Note: This Question is unanswered, help us to find answer for this one

442.
Consider the following code: MyClasscls = new MyClass("Test Class"); System.out.println(cls); What is the best implementation for printing "Test Class" to the output?

It will output Test Class to the output without any other implementation.

Override the toString method in this class and return the string which passes in the constructor.

It will give a compile error because an object can't be passed to the System.out.println method.

Answer

Correct Answer: Override the toString method in this class and return the string which passes in the constructor.

Note: This Question is unanswered, help us to find answer for this one

443.
Which terms are applicable to the given code? Select all that apply. abstract class Widget { public abstract void draw(); } class Clock extends Widget { public void draw() { // Clock implementation of draw() } } class NewsHeadlines extends Widget { public void draw() { // NewsHeadlines implementation of draw() } } class StockQuotes extends Widget { public void draw() { // StockQuotes implementation of draw() } } public class Test5 { public static void main(String[] args) { java.util.List widgets = new java.util.LinkedList(); widgets.add(new Clock()); widgets.add(new NewsHeadlines()); widgets.add(new StockQuotes()); for (Widget w : widgets) w.draw(); } }

overloading

overriding

polymorphism

autoboxing

Answer

Correct Answer: overriding
polymorphism

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

444.
Which of the following code snippets will convert variables from long to int and int to long?

inti = 5, j = 10, a; double k = 15, l = 20, b; a = (int) (k + l); b = i + j;

inti = 5, j = 10, a; double k = 15, l = 20, b; a = (int) k + l; b = i + j;

inti = 5, j = 10, a; double k = 15, l = 20, b; a = (int) (k + l); b = (double) i + j;

inti = 5, j = 10, a; double k = 15, l = 20, b; a = (int) k + l; b = (double) i + j;

Answer

Correct Answer: inti = 5, j = 10, a; double k = 15, l = 20, b; a = (int) (k + l); b = i + j;

Note: This Question is unanswered, help us to find answer for this one

445.
What would be the URL syntax for using third party drivers for establishing a connection with a DBMS having a subprotocol named "webx"?

jdbc:odbc:webx:dsn name

odbc:jdbc:webx:dsn name

jdbc:webx:dsn name

thin:jdbc:odbc:dsn:dsn name

thick:jdbc:odbc:dsn:dsn name

Answer

Correct Answer: jdbc:webx:dsn name

Note: This Question is unanswered, help us to find answer for this one

446.
What is the name of the process conducted by a bean builder tool to determine properties, methods and events of a JavaBean?

introspection

run-time type information

due diligence

code inspection

Answer

Correct Answer: introspection

Note: This Question is unanswered, help us to find answer for this one

447.
Which of the following is not a Java keyword?

strictfp

for

wait

while

try

Answer

Correct Answer: wait

Note: This Question is unanswered, help us to find answer for this one

448.
Which of the following is true about the Java Cryptography Extension (JCE)?

It is included with the Java 2 platform.

It is included with the Java 1 platform.

It implements cryptographic algorithms.

It contains the Java Security API.

Answer

Correct Answer: It is included with the Java 2 platform.

Note: This Question is unanswered, help us to find answer for this one

449.
A previously saved handle has to be retrieved from an EJBObject named 'bookEJBObject'. The following remote interface has been written to restart the processing for that particular request: 1. ObjectInputStream stream = 2. newObjectInputStream(new FileInputStream(fileName)); 3. 4. Handle bookHandle = (Handle) stream.readObject(); 5. 6. BookRemoteInterfacebookEjbObject = (BookRemoteInterface) XX() ; Which of the following should be substituted to Method XX() on line 6?

javax.rmi.PortableRemoteObject(bookHandle.getEJBObject(), BookRemoteInterface);

javax.rmi.PortableRemoteObject(EJBObject, BookRemoteInterface);

javax.rmi.PortableRemoteObject.narrow(bookHandle.getEJBObject(), BookRemoteInterface.class);

javax.rmi.PortableRemoteObject.narrow(bookHandle, BookRemoteInterface);

BookHandle.getEJBObject()

Answer

Correct Answer: javax.rmi.PortableRemoteObject.narrow(bookHandle.getEJBObject(), BookRemoteInterface.class);

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450.
Which statements are true regarding ServletContextInit Parameters in the deployment descriptor?

They are set at deployment-time, but accessed at run-time.

They are accessible from any session within that context.

They are not set at deployment-time, but accessed at run-time.

They are set at deployment-time and can be updated at run-time.

Answer

Correct Answer: They are set at deployment-time, but accessed at run-time.
They are set at deployment-time and can be updated at run-time.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

451.
Which two statements among the following apply to redirecting an HTTP request to another URL in JSP?

The path must be absolute.

The path must be relative.

The redirect method must be called before the response body is committed, otherwise an IllegalStateException is thrown.

The path may be relative or absolute.

Answer

Correct Answer: The path must be relative.
The redirect method must be called before the response body is committed, otherwise an IllegalStateException is thrown.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

452.
An online shop employs a stateless session bean (named ‘Eshop’) to process the request. ‘Eshop’

Uses a declarative transaction management system. The following code is from the XML deployment descriptor file of the bean:

<ejb-jar>

<enterprise-beans>

<session>

 <ejb-name>Eshop</ejb-name>

 <home>com. solution. EshopHome</home>

 <remote>com. Solution. Eshop</remote>

 <local>com. Solution. EshopLocalHome<.local-home>

 <local>com. Solution. EshopLocal</local>

 <ejb-class>com. Solution. eshopBean</ejb-class>

</session>

</enterprise-beans>

</ejb-jar>

The session and transaction attributes are to be coded in the numbered 10 and 11. Which of the

Following options should be used to make the bean work as expected?

session>Stateless /session> transaction>Container /transaction>

<session>Stateful</session> <transaction>Bean</transaction>

<session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

<session-type>Stateful</session-type> <transaction-type>Bean</transaction-type>

<session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

Answer

Correct Answer: <session-type>Stateless</session-type> <transaction-type>Container</transaction-type>
<session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

Note: This question has more than 1 correct answers

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453.
Which statements are true regarding using wildcards in java code that uses generics? Select all true statements.

A wildcard without a bound can be used.

A wildcard with a lower bound can be used.

A wildcard with a upper bound can be used.

A wildcard with both a lower and upper bound can be used.

Answer

Correct Answer: A wildcard with a lower bound can be used.
A wildcard with a upper bound can be used.
A wildcard with both a lower and upper bound can be used.

Note: This question has more than 1 correct answers

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454.
Which of the following Java technologies support transaction processing?

RMI

CORBA

JTS

JMAPI

JDBC

Answer

Correct Answer: JTS
JDBC

Note: This question has more than 1 correct answers

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455.
What is the best way to return an array from a function?

public String[] test(){ String i[] = new String[5]; return i; }

public String[] test(){ String i[] = new String[5]; return i[]; }

public String test(){ String i[] = new String[5]; return i[]; }

public String test(){ String i[] = new String[5]; return i; }

Answer

Correct Answer: public String[] test(){ String i[] = new String[5]; return i; }

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456.
An ArrayList can be shuffled using the Knuth shuffle method by calling Collections.shuffle() method and passing the ArrayList object to it. What is the best way to do a Knuth shuffle on a stack data structure?

By using Collections.shuffle() and passing the Stack object to it, similar to ArrayList Knuth shuffle.

Stacks don't have a shuffle method, so java.util.List has to be implemented, and its shuffle method overridden.

Stacks don't have a shuffle method, so java.util.Collections has t o be implemented, and its shuffle method overridden.

Answer

Correct Answer: By using Collections.shuffle() and passing the Stack object to it, similar to ArrayList Knuth shuffle.

Note: This Question is unanswered, help us to find answer for this one

457.
Which code snipped is the best to check whether a String s contains text "oDesk"?

if ("oDesk".equals(s))

if (s.equals("oDesk"))

if (s == "oDesk")

if (oDesk == "s")

Answer

Correct Answer: if (s.equals("oDesk"))

Note: This Question is unanswered, help us to find answer for this one

458.
Which of the following statements are true regarding declaring a servlet instance in a deployment descriptor?

The tags are nested within web-app> tags.

The tags do not define parameters.

The tags are <servlet-instance></servlet-instance>.

It specifies the fully qualified class name of the servlet.

Answer

Correct Answer: The tags are nested within web-app> tags.
It specifies the fully qualified class name of the servlet.

Note: This question has more than 1 correct answers

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459.
Which of the following interfaces makes it possible for Java to save an object to a file and turn it into a data stream?

java.io.Serialization

java.net.Serializable

java.net.Serialization

java.io.Serializable

java.net.io.Serializable

Answer

Correct Answer: java.io.Serializable

Note: This Question is unanswered, help us to find answer for this one

460.
What exception is thrown by this code, if arr[j]>arr[j+1]:

public static void main(String[] args) {

int []arr={12,23,43,34,3,6,7,1,9,6};

 {

int temp;

for (inti=0;i<arr.length;i++)

 {

for (int j=0;j<arr.length-i;j++ )

 {

if (arr[j]>arr[j+1])

 {

temp=arr[j];

arr[j+1]=arr[j];

arr[j+1]=temp;

 }

 }

 }

 }

for(inti=0; i<arr.length; i++)

 {

System.out.print(arr[i] + " ");

 }

 }

NumberFormatException

ArrayIndexOutOfBoundException

IOException

Answer

Correct Answer: ArrayIndexOutOfBoundException

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461.
Which of the following code snippets will take transform input string "2012/06/05" to output string "05 - 06 - 2012"?

String dateString = "2012/06/05"; Date date = new SimpleDateFormat("yyyy/MM/dd").parse(dateString); SimpleDateFormat sdf = new SimpleDateFormat("dd - MM - yyyy"); System.out.println(sdf.format(date));

String dateString = "2012/06/05"; Date date = new SimpleDateFormat("yyyy/MM/dd").format(dateString); SimpleDateFormat sdf = new SimpleDateFormat("dd - MM - yyyy"); System.out.println(sdf.parse(date));

String dateString = "2012/06/05"; Date date = new SimpleDateFormat("dd - MM - yyyy").format(dateString); SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); System.out.println(sdf.parse(date));

String dateString = "2012/06/05"; Date date = new SimpleDateFormat("dd - MM - yyyy").parse(dateString); SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); System.out.println(sdf.format(date));

Answer

Correct Answer: String dateString = "2012/06/05"; Date date = new SimpleDateFormat("yyyy/MM/dd").parse(dateString); SimpleDateFormat sdf = new SimpleDateFormat("dd - MM - yyyy"); System.out.println(sdf.format(date));

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462.
In generics code, the question mark (?) is called the?

Wildcard

Raw type

Diamond

Type parameter

Answer

Correct Answer: Wildcard

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463.
Which of the following transaction modes are supported by Enterprise Java Beans?

TX_NOT_SUPPORTED

TX_BEAN_MANAGED

TX_REQUIRED

TX_MANDATORY

All of the above

Answer

Correct Answer: All of the above

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464.
Which of the following is true?

Each registered name for a servlet is associated with one instance of the servlet.

Each registered name for a classloader is associated with one instance of the servlet.

Each registered name for a servlet is associated with two instances of the servlet.

Each registered name for a servlet is not associated even with one instance of the servlet.

Each alias for a servlet is associated with one instance of the servlet.

Answer

Correct Answer: Each registered name for a servlet is associated with one instance of the servlet.

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465.
With regard to the passivation of beans, which of the following statements is incorrect? A. The process is possible in all the enterprise beans. B. It is accompanied by some vendor specific methods, which are similar to java serialization.

Both A and B

None of the above

Answer

Correct Answer: A

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466.
Which of the following are liveness problems of a concurrent application?

deadlock

starvation

livelock

synchronization

Answer

Correct Answer: deadlock

Note: This Question is unanswered, help us to find answer for this one

467.
Which distributed object technology is most appropriate for systems that consist entirely of Java objects?

RMI

CORBA

DCOM

COM

JDBC

Answer

Correct Answer: RMI

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468.
What is the output of the given program? public class Test121 extends _Test121 { { System.out.print("_INIT"); } static { System.out.print("_STATIC"); } Test121() { System.out.print("_CONST"); } public static void main(String[] args) { new Test121(); System.out.print("_|"); new Test121(); } } class _Test121 { { System.out.print("_BIN"); } static { System.out.print("_START"); } _Test121() { System.out.print("_BASE"); } }

_START_STATIC_BIN_BASE_INIT_CONST_|_BIN_BASE_INIT_CONST

_START_STATIC_BIN_BASE_INIT_CONST_|_INIT_CONST

_STATIC_START_BIN_INIT_BASE_CONST_|_BIN_INIT_BASE_CONST

_START_STATIC_BIN_INIT_BASE_CONST_|_BASE_CONST

Answer

Correct Answer: _START_STATIC_BIN_BASE_INIT_CONST_|_INIT_CONST

Note: This Question is unanswered, help us to find answer for this one

469.
What would be the result when the given code is compiled and ran? public class Test99 { int main() { System.out.println("alpha"); return 0; } public static void main(String args) { System.out.println("beta"); } final static public void main(String[] s) { System.out.println("gamma"); } }

compiles, runs, and prints "alpha"

compiles, runs, and prints "beta"

compiles, runs, and prints "gamma"

does not compile, because the main() method cannot be overloaded

Answer

Correct Answer: compiles, runs, and prints "beta"

Note: This Question is unanswered, help us to find answer for this one

470.
What is the best way to access a HashMap of SortedSet entries?

Map String, SortedSet String>>makeSetMap = new HashMap String, SortedSet String>>(); for (String key : makeSetMap.keySet()) { // loop through all manufacturers SortedSet String> cars = makeSetMap.get(key); for (String c : cars) { // loop through all cars of that key System.out.println(key + " " + c); } }

Map<String, SortedSet<String>>makeSetMap = new HashMap<String, SortedSet<String>>(); for (String key : makeSetMap.keySet()) { // loop through all manufacturers SortedSet<String> cars = makeSetMap.getValue(key); for (String c : cars) { // loop through all cars of that key System.out.println(key + " " + c); } }

HashMap<String, SortedSet<String>>makeSetMap = new HashMap<String, SortedSet<String>>(); for (String key : makeSetMap.keySet()) { // loop through all manufacturers SortedSet<String> cars = makeSetMap.get(key); for (String c : cars) { // loop through all cars of that key System.out.println(key + " " + c); } }

HashMap<String, SortedSet<String>>makeSetMap = new HashMap<String, SortedSet<String>>(); for (String key : makeSetMap.getKeys()) { // loop through all manufacturers SortedSet<String> cars = makeSetMap.get(key); for (String c : cars) { // loop through all cars of that key System.out.println(key + " " + c); } }

Answer

Correct Answer: Map String, SortedSet String>>makeSetMap = new HashMap String, SortedSet String>>(); for (String key : makeSetMap.keySet()) { // loop through all manufacturers SortedSet String> cars = makeSetMap.get(key); for (String c : cars) { // loop through all cars of that key System.out.println(key + " " + c); } }

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471.
What is the result of compiling and running the given code? public class Test75 { public static void main(String[] args) { System.out.println(new A(){{}}.toString()); } } class A { public String toString() { return getClass().getName(); } }

It gets a compiler error.

It compiles, but throws NullPointerException at run-time.

It compiles, runs, and prints "Test75" (without quotation marks).

It compiles, runs, and prints "Test75$1" (without quotation marks).

Answer

Correct Answer: It compiles, but throws NullPointerException at run-time.

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472.
In an RMI application, network data destined for a particular object received by an object is known as:

Skeleton object

Stub object

skeleton() method

stub() method

RMI object

Answer

Correct Answer: Stub object

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473.
The EJB specification defines six distinct roles in the application development and deployment life cycle. Which of the following roles is not mentioned in it?

Enterprise Bean Provider

EJB Developer

EJB Server Provider

Application Assembler

Deployer

System Administrator

Answer

Correct Answer: EJB Developer

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474.
What is needed to define a property of a JavaBean?

supply public getter and setter methods

mark a member variable with @Property annotation

nothing, the property will be detected automatically by the IDE

nothing, the property will be generated automatically by the compiler

Answer

Correct Answer: supply public getter and setter methods

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475.
Which of the following are "keywords" in Java?

default

NULL

String

throws

Answer

Correct Answer: default
throws

Note: This question has more than 1 correct answers

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476.
Which code snippet will check for the existence of the file «text.txt» in the current location?

File f = new File(Â«text.txtÂ»); System.out.println(f.exists());

File f = new File(); f.setName(Â«text.txtÂ»); System.out.println(f.exists());

File f = new File(Â«text.txtÂ»); System.out.println(f.equals(f));

Answer

Correct Answer: File f = new File(); f.setName(Â«text.txtÂ»); System.out.println(f.exists());

Note: This Question is unanswered, help us to find answer for this one

477.
What is the easiest and fastest way to sort the following string array?
String[] myString = {"cat","lion", "dog", "mouse"}

Array.Sort(myString);

Collections.Sort(myString);

Arrays.Sort(myString);

Answer

Correct Answer: Collections.Sort(myString);

Note: This Question is unanswered, help us to find answer for this one

478.

Consider the following code: public class Jam { public void apple(int i, String s) { } //ABC } Choose possible valid code replacements of "//ABC" among the choices:

public void apple(String s, int i) {}

public int apple(int i, String s) {}

public void apple(int i, String mystring) {}

public void Apple(int i, String s) {}

Answer

Correct Answer: public void apple(String s, int i) {}
public void Apple(int i, String s) {}

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

479.
The JDK comes with a special program that generates skeleton and stub objects that is known as:

java.rmi.Remote

rmi

rmic

rmijava

javac

Answer

Correct Answer: rmic

Note: This Question is unanswered, help us to find answer for this one

480.
Which of the following correctly creates a thread using Runnable()?

Runnable r = new Runnable(); r.start();

Runnable r = new Runnable(new Thread({ public void run(){ } })); r.start();

Runnable r = new Runnable(new Thread({ public void run(){ } })); r.run();

Thread t = new Thread(new Runnable(){ public void run(){ } }); t.start();

Answer

Correct Answer: Runnable r = new Runnable(new Thread({ public void run(){ } })); r.run();

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481.
1 <libraryPrefix:handlerName parameterNAme="value"> 2 <%=23*counter %> 3 Congratulations! Which of the following is the correct way to complete the code snippet above?

</libraryPrefix:handlerName>

</libraryPrefix:handlerName paremeterName="value">

</handlerName>

Answer

Correct Answer: </libraryPrefix:handlerName>

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482.
Which of the following is true regarding DDL statements?

DDL statements are a portion of the SQL standard that is concerned with the creation, deletion and modification of database objects like tables.

DDL statements are a portion of the SQL standard is concerned with manipulating the data in a database.

DDL statements can be rolled back.

DDL statements cannot be rolled back.

Answer

Correct Answer: DDL statements are a portion of the SQL standard that is concerned with the creation, deletion and modification of database objects like tables.
DDL statements are a portion of the SQL standard is concerned with manipulating the data in a database.
DDL statements cannot be rolled back.

Note: This question has more than 1 correct answers

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483.
Assuming the custom tag is GLOOP and the prefix is TWONG, which of the following is the correct JSP syntax for an empty custom tag?

TWONG:GLOOP/>

<GLOOP:TWONG/>

<GLOOP:TWONG></GLOOP:TWONG>

<TWONG:GLOOP></TWONG:GLOOP>

Answer

Correct Answer: <GLOOP:TWONG></GLOOP:TWONG>
<TWONG:GLOOP></TWONG:GLOOP>

Note: This question has more than 1 correct answers

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484.
What is the output of the given console application? public class Test31 { public static void main(String[] args) { test(); } public static void test() { try { System.out.print("-try"); return; } catch (Exception e) { System.out.print("-catch"); } finally { System.out.print("-finally"); } } }

-try

-try-catch

-try-finally

-try-catch-finally

Answer

Correct Answer: -try-finally

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485.
Which of the following will programmatically throw an exception?

throw new Exception();

throws new Exception();

throws Exception();

It is not possible to throw an exception programmatically.

Answer

Correct Answer: throw new Exception();

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486.
Assuming there is database recovery/backup system in place, which of the following statements is true with regard to committed and uncommitted data of entity beans?

Committed data will not survive a server crash.

Neither committed nor uncommitted data will survive a server crash.

Both committed and uncommitted data will survive a server crash.

Both committed and uncommitted data will survive a server crash if clustering is used.

Answer

Correct Answer: Both committed and uncommitted data will survive a server crash if clustering is used.

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487.
Which exception must a setter of a constrained JavaBean property throw to prevent the property value from changing?

PropertyVetoException

IllegalArgumentException

IllegalComponentStateException

InvalidAttributeValueException

Answer

Correct Answer: PropertyVetoException

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488.
Which of the following is the best option for scaling existing an application due to resource requirements, without changing its code?

Moving business objects to the client's machine

Moving business objects to another server machine

Moving business objects to the client's hard drive

Moving business objects to the client's RAM

Moving business objects to another class

Answer

Correct Answer: Moving business objects to the client's RAM

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489.
Which of the following statements are true regarding the structure of a WebArchive file?

It has a JAR extension.

It is a JAR archive of the WebApplication structure.

It has a WAR extension.

It is extracted by the container upon the first call to any servlet it contains.

Answer

Correct Answer: It has a WAR extension.
It is extracted by the container upon the first call to any servlet it contains.

Note: This question has more than 1 correct answers

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490.
Which of the following statements regarding Enterprise Java Beans is incorrect?

Entity beans model business data.

Session beans model business processes.

Message beans send synchronous messages.

None of these.

Answer

Correct Answer: Message beans send synchronous messages.

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491.
Which method in the HttpServlet class corresponds to the HTTPPUT method?

put

doPut

httpPut

putHttp

Answer

Correct Answer: put

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492.
With regard to the destroy lifecycle method, identify the correct statements about its purpose or about how and when it is invoked.

It gives the servlet an opportunity to clean up resources.

Like try-catch, it is called upon an exception.

It is rarely used but can be called to remove a servlet from memory.

It isn't called if the server crashes.

Answer

Correct Answer: It gives the servlet an opportunity to clean up resources.
It is rarely used but can be called to remove a servlet from memory.

Note: This question has more than 1 correct answers

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493.
Which of the following is false?

A scrollable ResultSet can be created in JDBC 2.0 API.

The cursor is moved forward using next().

The cursor is moved backward using previous().

A while loop can be used because next() & previous() methods return false beyond the resultset.

A while loop can be used because next () & previous () methods return -1 beyond the resultset.

Answer

Correct Answer: A while loop can be used because next () & previous () methods return -1 beyond the resultset.

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494.
Select all true statements:

A class cannot be declared final.

Methods and variables can be declared final.

A class can be declared as final abstract.

Abstract methods can be overridden.

Answer

Correct Answer: Methods and variables can be declared final.
A class can be declared as final abstract.
Abstract methods can be overridden.

Note: This question has more than 1 correct answers

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495.
Which of the following is not a tier of three-tier architecture?

Client Interface

Business Logic

Security

Data Storage

Answer

Correct Answer: Security

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496.
Consider the following code: public static void main(String bicycle[]) { System.out.println(bicycle[0]); } What would be the result if "java TwoTyre one two" is entered in the command line?

one

two

TwoTyre

None of the above

Answer

Correct Answer: one

Note: This Question is unanswered, help us to find answer for this one

497.
Given a method declared as:

public static List process(List nums)

A programmer wants to use the method like this:

// INSERT DECLARATIONS HERE

output = process(input);

Which pair of declarations could be placed at // INSERT DECLARATIONS HERE to allow the code to compile? (Choose all that apply.)

ArrayList<Integer> input = null; ArrayList<Integer> output = null;

ArrayList<Integer> input = null; List<Integer> output = null;

List<Integer> input = null; List<Integer> output = null;

Answer

Correct Answer: ArrayList<Integer> input = null; ArrayList<Integer> output = null;

ArrayList<Integer> input = null; List<Integer> output = null;

Note: This question has more than 1 correct answers

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498.
Which of the following code snippets will correctly convert from one time zone to another time zone?

DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(TimeZone.getTimeZone("GMT-8")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(TimeZone.getTimeZone("GMT+5")); System.out.println(formatter.format(date));

DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(TimeZone.getTimeZone("PST")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(TimeZone.getTimeZone("IST")); System.out.println(formatter.format(date));

DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(new TimeZone("PST")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(new TimeZone("IST")); System.out.println(formatter.format(date));

DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(new TimeZone("GMT-8")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(new TimeZone("GMT+5")); System.out.println(formatter.format(date));

Answer

Correct Answer: DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(TimeZone.getTimeZone("GMT-8")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(TimeZone.getTimeZone("GMT+5")); System.out.println(formatter.format(date));
DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); formatter.setTimeZone(new TimeZone("GMT-8")); Date date = formatter.parse("01/01/2012 05:00:00"); System.out.println(formatter.format(date)); formatter.setTimeZone(new TimeZone("GMT+5")); System.out.println(formatter.format(date));

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

499.
What is/are the OOP concepts demonstrated by this code:

public class Test {

public static void main(String[] args){

        Animal a = new Dog();

new Hospital().treatAnimal(a);

    }

}

class Animal {

public void sayIt(){

    }

}

class Dog extends Animal{

public void sayIt(){

System.out.println("I am Dog");

    }

}

class Cat extends Animal{

public void sayIt(){

System.out.println("I am Cat");

    }

}

class Hospital{

public void treatAnimal(Animal a){

if(a instanceof Dog){

a.sayIt();

        } else {

a.sayIt();

        }

    }

}

Polymorphism

Inheritence

Abstraction

Answer

Correct Answer: Polymorphism

Note: This Question is unanswered, help us to find answer for this one

500.
What will happen to the running session beans if the EJB container crashes or restarts?

They will be destroyed.

They will keep on running.

Their execution will be halted temporarily.

None of these.

Answer

Correct Answer: They will be destroyed.

Note: This Question is unanswered, help us to find answer for this one

501.
What is the central abstraction of the Java Servlet API?

The Servlet interface

The GenericServlet

The HttpServlet

The Servlet package

The Servlet object

Answer

Correct Answer: The Servlet interface

Note: This Question is unanswered, help us to find answer for this one

502.
Which of the following is true regarding sleep() and wait() in threaded environments?

Both can take time in milliseconds as a parameter and will execute when the time is expired.

Both will wait for another thread’s notify() method before it can execute.

The wait() method will wait for a specific time (in milliseconds) and continue execution afterwards, while sleep() will wait for another thread’s notify() method before it will execute.

The sleep() method will wait for a specific time (in milliseconds) and continue execution afterwards, while wait() will wait for another thread’s notify() method before it will execute.

Answer

Correct Answer: The sleep() method will wait for a specific time (in milliseconds) and continue execution afterwards, while wait() will wait for another thread’s notify() method before it will execute.

Note: This Question is unanswered, help us to find answer for this one

503.
Which of the following symbols are metacharacters supported by the java.util.regex API?

Answer

Correct Answer: .
\

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

504.
What is the output of the given program?

public class Test117 {

{

System.out.print(«_INIT»);

}

static {

System.out.print(«_STATIC»);

}

Test117() {

System.out.print(«_CONST»);

}

public static void main(String[] args) {

System.out.print(«_MAIN»);

new Test117();

}

}

_STATIC_MAIN_INIT_CONST

_STATIC_MAIN_CONST_INIT

_INIT_STATIC_CONST_MAIN

_STATIC_INIT_CONST_MAIN

Answer

Correct Answer: _STATIC_MAIN_INIT_CONST

Note: This Question is unanswered, help us to find answer for this one

505.
Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?

String value=req.getInitParameter(10);

String value=req.getInitParameter(«product»);

String value=res.getParameter(«product»);

String value=req.getParameter(«product»);

Answer

Correct Answer: String value=req.getParameter(«product»);

Note: This Question is unanswered, help us to find answer for this one

506.
Why can’t a string’s compareTo method be overridden?

The String class is final, therefore its methods can’t be overridden.

The String class doesn’t have a compareTo method.

A compareTo method isn’t built-in; it has to be manually implemented.

Answer

Correct Answer: The String class is final, therefore its methods can’t be overridden.

Note: This Question is unanswered, help us to find answer for this one

507.
Which of the following methods can be used for reporting a warning on a Connection object, Statement object & ResultSet object?

getWarnings()

getWarned()

getWarning()

getError()

getErrors()

Answer

Correct Answer: getWarnings()

Note: This Question is unanswered, help us to find answer for this one

508.
Which of the following is a well-known HTTP port?

8080

137

Answer

Correct Answer: 80

Note: This Question is unanswered, help us to find answer for this one

509.
Which distributed object technology is most appropriate for systems that consist of objects written in different languages and that execute on different operating system platforms?

RMI

CORBA

COBRA

DCOM

COM

Answer

Correct Answer: CORBA

Note: This Question is unanswered, help us to find answer for this one

510.
What is the output of the given program?

public class Test89 {

public static void main(String[] args) {

T x = new T(«X», null); x.start();

T y = new T(«Y», x); y.start();

T z = new T(«Z», y); z.start();

}

}

class T extends Thread {

private Thread predecessor;

private String name;

public T(String name, Thread predecessor) {

this.predecessor = predecessor;

this.name = name;

}

public void run() {

try {

Thread.sleep((int)(Math.random()*89));

System.out.print(name);

} catch (InterruptedException ie) {

ie.printStackTrace();

}

}

}

always XYZ

always ZYX

any of the following: XYZ, XZY, YXZ, YZX, ZXY, ZYX

any of the following: XYZ, ZYX

Answer

Correct Answer: any of the following: XYZ, XZY, YXZ, YZX, ZXY, ZYX

Note: This Question is unanswered, help us to find answer for this one

511.
Which of the following methods should be invoked by the container to get a bean back to its working state?

EJBPassivate()

EJBActivate()

EJBRemove()

EJBOpen()

EJBActivation()

Answer

Correct Answer: EJBActivate()

Note: This Question is unanswered, help us to find answer for this one

512.
With regard to the servlet context listener, which of the following methods is valid?

contextListenerEvent

contextListenerInitialized

contextInitialized

contextListenerDestroyed

Answer

Correct Answer: contextInitialized

Note: This Question is unanswered, help us to find answer for this one

513.
Which is the right syntax of a javadoc comment for parameter of the method test(int)?

public class Test125 {

public static void main(String[] args) {

new Test125().test(125);

}

public void test(int a) {

for (int i=0; i<a; System.out.println(i++));

}

}

@param a Description

@parameter int a Description

@param Description

@parameter a Description

Answer

Correct Answer: @param a Description

Note: This Question is unanswered, help us to find answer for this one

514.
The transaction attribute of a bean is set to 'TX_REQUIRES_NEW.' What can be inferred about its behavior?

It initiates a new transaction only when the previous one is concluded.

It initiates a new transaction without waiting for the previous one to conclude.

It sends the request to the EJB container for initiating a new bean.

The bean manages its own transaction.

Answer

Correct Answer: The bean manages its own transaction.

Note: This Question is unanswered, help us to find answer for this one

515.
SQLException has a feature of chaining — identify the right code to execute the same from the following:

catch(SQLException e) { out.println(e.getMessage()); while((e=e.getNextException())!=null) { out.println(e.getMessage()); } }

catch(SQLException e) { out.println(e.getNextException()); while((e=e.getMessage())!=null) { out.println(e.getMessage()); } }

catch(SQLException e) { out.println(e.getMessage()); while((e=e.getEncapsulatedException())!=null) { out.println(e.getMessage()); } }

catch(ClassNotFoundException e) { out.println(e.getMessage()); while((e=e.getNextException())!=null) { out.println(e.getMessage()); } }

catch(ClassNotFoundException e){ { out.println(e.getMessage()); } }

Answer

Correct Answer: catch(SQLException e) { out.println(e.getMessage()); while((e=e.getNextException())!=null) { out.println(e.getMessage()); } }

Note: This Question is unanswered, help us to find answer for this one

516.
Which of the following is the correct syntax for creating a Session object?

HttpSession ses=request.getSession(true);

HttpSession ses=getSession(true);

HttpSession ses=request.getSession();

HttpSession ses=request.getSessionObject(true);

HttpSession ses=response.getSession(true);

Answer

Correct Answer: HttpSession ses=request.getSession(true);
HttpSession ses=request.getSession();

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

517.
The principal finder method that must be implemented by every entity bean class is:

findByPrimaryKey()

ejbGetByPrimaryKey()

ejbFindPrimayKey()

getPrimaryKey()

getFinder()

Answer

Correct Answer: findByPrimaryKey()

Note: This Question is unanswered, help us to find answer for this one

518.
Why would the following code snippet not compile successfully?

if (mangoList instanceof List<Mango>) { System.out.println(«true»); }

It is unknown whether mangoList is a List type.

Generic types are erased before runtime.

The instanceof keyword only works on primitive types.

Answer

Correct Answer: Generic types are erased before runtime.

Note: This Question is unanswered, help us to find answer for this one

519.
Consider the following:

String sub ="hello".substring(2, 3);

What is the value of sub?

''ll''

''elo''

''l''

''llo''

Answer

Correct Answer: ''l''

Note: This Question is unanswered, help us to find answer for this one

520.
What would happen on compiling and running the following code?

public class Test
{
     public static void main (String args[])
     {
     TestThread t = new TestThread ();
     t.setValue (5);
     t.start ();
     t.setValue (10);
     }
}
class TestThread extends Thread
     {
     private int value;
     synchronized public void setValue (int v)
     {
         value = v;
     }
     public void run ()
     {
     System.out.println ("before: " + value);
     setValue (50);
     System.out.println ("after: " + value);
     }
}

When run, this code will always print ''before: 10'' and ''after: 50''

When run, this code will always print ''before: 5'' and ''after: 50''

When run, this code will always print ''before: 5'' and ''after: 10''

It is not possible to predict what will be printed, it might print different things regarding the order in which the statements are executed

Answer

Correct Answer: When run, this code will always print ''before: 5'' and ''after: 10''

Note: This Question is unanswered, help us to find answer for this one

521.
Can Java be used to send ICMP packets?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

522.
Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?

Collection

Set

Map

SortedSet

Answer

Correct Answer: Map

Note: This Question is unanswered, help us to find answer for this one

523.
How does the set collection deal with duplicate elements?

Duplicate values will cause an error at compile time

A set may contain elements that return duplicate values from a call to the equals method

An exception is thrown if you attempt to add an element with a duplicate value

The add method returns false if you attempt to add an element with a duplicate value

Answer

Correct Answer: The add method returns false if you attempt to add an element with a duplicate value

Note: This Question is unanswered, help us to find answer for this one

524.
For a class defined inside a method, what rule governs access to the variables of the enclosing method?

The class can only access transient variables

The class can only access static variables

The class can only access final variables

The class can access any variable

Answer

Correct Answer: The class can only access final variables

Note: This Question is unanswered, help us to find answer for this one

525.
Is the following code valid?

InetAddress ad = InetAddress.getByName ("195.186.2.111");

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

526.
How many objects are created by the following code?

Object a, b, c, d, e;
e = new Object ();
b = a = e;
e = new Object ();

This code is invalid

Answer

Correct Answer: 2

Note: This Question is unanswered, help us to find answer for this one

527.
What is Abstraction?

An act of representing essential features without including details or working methodology

An act of representing essential features along with the details or working methodology

An act of acquiring properties of some other object

An ability to be present in more than one form

Answer

Correct Answer: An act of representing essential features without including details or working methodology

Note: This Question is unanswered, help us to find answer for this one

528.
Which of the following will ensure that garbage collection runs?

System.free()

Runtime.gc()

Object.gc()

System.gc()

None of the above

Answer

Correct Answer: None of the above

Note: This Question is unanswered, help us to find answer for this one

529.
Which of the following will ensure that garbage collection runs?

All the values of column one are printed

Nothing is printed

The code will fail to compile

The code will throw an exception as records are being printed after the connection is closed

Answer

Correct Answer: The code will throw an exception as records are being printed after the connection is closed

Note: This Question is unanswered, help us to find answer for this one

530.
Which sequence will be printed when the following program is run?

import java.util.*;
public class Test
{
public static void main(String str[])
{
List l = new ArrayList();
l.add(''1'');
l.add(''2'');
l.add(1,''3'');
System.out.println(l);
}
}

[1, 3, 2]

[1, 3, 1]

[1, 1, 3]

[1, 1, 2]

This code will generate an error

Answer

Correct Answer: [1, 3, 2]

Note: This Question is unanswered, help us to find answer for this one

531.
Which of the following statements are correct?

A class is an instance factory

A class is a template for creating an entity

A class is a set of all the instances of a pattern

None of the above

Answer

Correct Answer: A class is an instance factory
A class is a template for creating an entity
A class is a set of all the instances of a pattern

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

532.
What would happen on trying to compile and run the following code?

public class Test
{
public static void main (String args[])
{
int iRand;
iRand = Math.random();
System.out.println(iRand);
}
}

A compilation error about random being an unrecognized method will occur

A random number between 0 and 1

A random number between 1 and 10

A compilation error referring to a cast problem

Answer

Correct Answer: A compilation error referring to a cast problem

Note: This Question is unanswered, help us to find answer for this one

533.
How many times can classes be nested within a class?

Any number of times

Answer

Correct Answer: Any number of times

Note: This Question is unanswered, help us to find answer for this one

534.
What is printed to the standard output if myMethod() is executed?

class MyPoint {
void myMethod() {
     int x, y;
     x = 5; y = 3;
     System.out.print( " ( " + x + ", " + y + " ) " );
     switchCoords( x, y );
     System.out.print( " ( " + x + ", " + y + " ) " );
}
void switchCoords( int x, int y ) {
     int temp;
     temp = x;
     x = y;
     y = temp;
     System.out.print( " ( " + x + ", " + y + " ) " );
}
}

(5, 3) (5, 3) (5, 3)

(5, 3) (3, 5) (3, 5)

(5, 3) (3, 5) (5, 3)

No output will be printed

Answer

Correct Answer: (5, 3) (3, 5) (5, 3)

Note: This Question is unanswered, help us to find answer for this one

535.
Choose the correct declarations for the main() method which will allow the class to be run as a standalone program:

public void main(String str[])

static public void main(String str[])

public static int main(String str[])

public static void main(String str[])

Answer

Correct Answer: static public void main(String str[])
public static void main(String str[])

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

536.
What is the method by which two or more applets can communicate with each other within one HTML page?

Multiple applets cannot communicate with each other within one HTML page

getCodeBase()

getDefaultContext()

getAppletContext()

Answer

Correct Answer: getAppletContext()

Note: This Question is unanswered, help us to find answer for this one

537.
What will be the output when this code is compiled and run?

public class Test
{
static int x = 10;
public Test ()
{
Bar b = new Bar ();
Bar b1 = new Bar ();
update (b);
update (b1);
}
private void update (Bar bar)
{
bar.x = ++x;
System.out.println (bar.x);
}
public static void main (String args[])
{
new Test ();
}
private class Bar
{
public int x = 10;
}
}

The code will fail to compile

11 12

11 11

12 12

Answer

Correct Answer: 11 12

Note: This Question is unanswered, help us to find answer for this one

538.
Which of these is not an event listener adapter defined in the java.awt.event package?

ActionAdapter

MouseListener

WindowAdapter

FocusListener

Answer

Correct Answer: ActionAdapter

Note: This Question is unanswered, help us to find answer for this one

539.
Can InetAddress be used with inet6?

Yes

No, InetAddress is an abstract class

Answer

Correct Answer: Yes
No, InetAddress is an abstract class

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

540.
Object.hashCode () will always return the same value for a given object. This is consistent from one execution of an application to another execution of the same application.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

541.
What will be the output when this code is compiled and run?

public class Test
{
public Test ()
{
Bar b = new Bar ();
Bar b1 = new Bar ();
update (b);
update (b1);
b1 = b;
update (b);
update (b1);
}
private void update (Bar bar)
{
bar.x = 20;
System.out.println (bar.x);
}
public static void main (String args[])
{
new Test ();
}
private class Bar
{
int x = 10;
}
}

The code will fail to compile

10 10 10 10

20 20 20 20

10 20 10 20

Answer

Correct Answer: 20 20 20 20

Note: This Question is unanswered, help us to find answer for this one

542.
What would happen on compiling and running the following code?

public class Anchor
{
public static void main(String[] argv)
{
new Anchor();
}
public Anchor()
{
String s[][] = new String[2][2];
System.out.println(s[1][1]);
System.out.println(s[1][2]);
}
}

Compilation error

Compiles and prints two blank lines at runtime

Compiles and prints null followed by ArrayIndexOutOfBoundsException

Compiles and prints a blank line followed by ArrayIndexOutOfBoundsException

Answer

Correct Answer: Compiles and prints null followed by ArrayIndexOutOfBoundsException

Note: This Question is unanswered, help us to find answer for this one

543.
What happens on attempting to compile and run the following code?

public class Graft
{
public static void main(String argv[])
{
Graft g = new Graft();
}
protected Graft()
{
for(int i =0; i <10; i ++)
{
System.out.println(i);
}
}
}

A Compilation error occurs because constructors cannot be declared protected

Successful compilation with output 0 to 9

A runtime error occurs because constructors cannot be declared protected

Successful compilation with output 0 to 10

Answer

Correct Answer: Successful compilation with output 0 to 9

Note: This Question is unanswered, help us to find answer for this one

544.
Which of the following are the methods of the Thread class?

stay()

go()

yield()

sleep(long millis)

Answer

Correct Answer: yield()
sleep(long millis)

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

545.
In which class is the notify method defined?

Thread

Applet

Runnable

Object

Answer

Correct Answer: Object

Note: This Question is unanswered, help us to find answer for this one

546.
What will be the output when this code is compiled and run?

public class Test
{
static int a;
int b;
public Test ()
{
int a, b, c;
a = b = c = 20;
System.out.println (a);
}
public static void main (String args[])
{
new Test ();
}
}

The code will fail to compile

True is printed

Nothing is printed

20 is printed

Answer

Correct Answer: 20 is printed

Note: This Question is unanswered, help us to find answer for this one

547.
Which of the following statements is not correct with regard to threads in Java?

A call to the wait method causes the calling thread to pause its execution

The wait and notify methods are defined in the Thread class

The synchronized keyword can be applied to either a method or a block of code

Any code that has calls to the wait or notify methods must be synchronized

Answer

Correct Answer: The wait and notify methods are defined in the Thread class

Note: This Question is unanswered, help us to find answer for this one

548.
Select the correct option based upon the following sample code:

public class Test
{
static int a;
int b;
public Test ()
{
int c;
c = a;
a++;
b += c;
System.out.println ("one");
}
public void Test ()
{
int c;
c = a;
a++;
b += c;
System.out.println ("two");
}
public static void main (String args[])
{
Test t = new Test ();
}
}

The code will fail to compile because there is a method with the same name as the class name

The code will fail to compile because there are 2 constructors with the same names and parameters

The code will fail to compile because the constructor is trying to access a static variable

The code will compile but will fail when run

The code will compile and run successfully. It will print ''one''

The code will compile and run successfully. It will print ''two''

Answer

Correct Answer: The code will compile and run successfully. It will print ''one''

Note: This Question is unanswered, help us to find answer for this one

549.
What is Encapsulation?

Wrapping functions into a single unit

Wrapping functions and data into a single unit

Making the whole data accessible to the outer world

Making the whole data and functions accessible to the outer world

Answer

Correct Answer: Wrapping functions and data into a single unit

Note: This Question is unanswered, help us to find answer for this one

550.
Which of the following illustrates correct synchronization syntax?

public synchronized void Process(void){}

public void Process(){ synchronized(this){ } }

public void synchronized Process(){}

public synchronized void Process(){}

Answer

Correct Answer: public void Process(){ synchronized(this){ } }
public synchronized void Process(){}

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

551.
One method in your application needs to be synchronized. Which of the following options are correct for synchronization?

public synchronized void Process(void){}

public void Process(){ synchronized(this){ } }

public void synchronized Process(){}

public synchronized void Process(){}

Answer

Correct Answer: public void Process(){ synchronized(this){ } }
public synchronized void Process(){}

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

552.
What would be the result of compiling and running the following code class?

public class Test
{
public static void main (String args[])
{
Test t = new Test ();
t.start ();
}
public void start ()
{
int i = 2;
int j = 3;
int x = i & j;
System.out.println (x);
}
}

The code will not compile

The code will compile but will give runtime error

The code will compile and print 2

The code will compile and print 1

Answer

Correct Answer: The code will compile and print 2

Note: This Question is unanswered, help us to find answer for this one

553.
Which of the following methods are members of the Vector class and allow you to input a new element?

addItem

append

insert

addElement

Answer

Correct Answer: addElement

Note: This Question is unanswered, help us to find answer for this one

554.
Will the following code bind srvSock ?

srvSock = new ServerSocket();

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

555.
For the given variables, which of the following will compile without an error?

char c = 'c';
int i = 50;
double d = 80;
long l = 200;
String s = "Goodbye";

s+=i;

i+=s;

c+=s;

c=c+i;

Answer

Correct Answer: s+=i;

Note: This Question is unanswered, help us to find answer for this one

556.
What would happen on trying to compile and run the following code?

public class MainCls
{
     public static void main(String argv)
     {
System.out.println("My Text");
     }
}

A compile error will be generated because 'main' is a reserved word and cannot be used for a class

"My Text" will be displayed

The code will compile. A runtime error will occur because 'main' is not properly defined

The code will compile. A runtime error will occur because constructor is not defined

Answer

Correct Answer: The code will compile. A runtime error will occur because 'main' is not properly defined

Note: This Question is unanswered, help us to find answer for this one

557.
Inheritance is a process by which the objects of parent class acquire the properties of the child class.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

558.
Which class contains a method to create a directory?

File

DataOutput

559.
What protocol is used by the DatagramSocket class?

STCP

UDP

TCP

FTP

None of the above

Answer

Correct Answer: UDP

Note: This Question is unanswered, help us to find answer for this one

560.
What is wrong with the following code?

class X extends Exception {}
public class Y
{
     public void foo()
     {
     try {
         b();
     }
     finally {
         ba();
     }
     catch (MyException e) {}
     }
public void b() throws X {
throw new X();
}
public void ba() throws RuntimeException {
throw new RuntimeException();
}
}

Nothing is wrong with the code

Finally block should come after the catch block

An empty catch block is not allowed

None of the above

Answer

Correct Answer: Finally block should come after the catch block

Note: This Question is unanswered, help us to find answer for this one

561.
All class methods in the java.lang package are thread safe. (in 1.5)

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

562.
Which of the following is a benefit derived from using OOPS?

Elimination of redundant code

Reusing the code

Ability to enhance and extend previously written code for new modules

Co-existence of multiple instances of objects

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

563.
What will be written to the standard output when the following program is run?

public class X {
   public static void main(String args[]) {
    System.out.println(11 ^ 2);
   }
}

121

Answer

Correct Answer: 9

Note: This Question is unanswered, help us to find answer for this one

564.
Which of the following methods is used to get the parameters of an applet?

getAppletContext()

getAppletInfo()

getParameter()

getParameters()

Answer

Correct Answer: getParameter()

Note: This Question is unanswered, help us to find answer for this one

565.
Are the following two statements equivalent?

A: Thread.yield ();

B: Thread.sleep (0);

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

566.
You want to loop through an array and stop when you come to the last element. Which of the following give information about the size of array, if its name is arMark?

arMark.size

arMark.size();

arMark.length;

arMark.length();

Answer

Correct Answer: arMark.length;

Note: This Question is unanswered, help us to find answer for this one

567.
Can ServerSocket be used with UDP?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

568.
Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?

class A {}
class B extends A {}
class C extends A {}
public class X {
public static void main(String args[]) {
A x = new A();
B y = new B();
C z = new C();
// insert statement here
}
}

x = y;

z = x;

y = (B)x;

y = (A)y;

Answer

Correct Answer: x = y;
y = (B)x;

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

569.
Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?

System.setGarbageCollection();

System.out.gc();

System.gc();

System.free();

Answer

Correct Answer: System.gc();

Note: This Question is unanswered, help us to find answer for this one

570.
What is the return type of the method ceil(double) from the Math class?

int

float

double

Integer

Double

Answer

Correct Answer: double

Note: This Question is unanswered, help us to find answer for this one

571.
What is the java.net.IDN class in 1.6?

Methods to resolve integrated domain names (IDNs), such domain names are special embedded names

Methods to swap bytes between network byte order and host byte order

Methods to convert internationalized domain names (IDNs) between a normal Unicode representation and an ASCII Compatible Encoding (ACE) representation

This class does not exist

None of the above

Answer

Correct Answer: Methods to convert internationalized domain names (IDNs) between a normal Unicode representation and an ASCII Compatible Encoding (ACE) representation

Note: This Question is unanswered, help us to find answer for this one

572.
What will be the output of the following code?

import java.util.;
public class Test
{
public static void main (String args[]) throws Exception
{
List l = new ArrayList ();
int a = (int)(3 2.5);
for (int i = 0; i < 10; i++)
l.add (i);
String s = "Hello";
l.add (a, s.getBytes ("UTF-8")[2]);
System.out.println (l);
}
}

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

[0, 1, 2, 3, 4, 5, 6, 108, 7, 8, 9]

[0, 1, 2, 3, 4, 5, 6, 108, 8, 9, 10]

Program won't compile

Answer

Correct Answer: [0, 1, 2, 3, 4, 5, 6, 108, 7, 8, 9]

Note: This Question is unanswered, help us to find answer for this one

573.
What will be the output of this program?

public class Test
{
public static void main (String args[])
{
int a, b;
a = 2;
b = 0;
System.out.println (g (a, new int[] {b}));
}
public static int g (int a, int b[])
{
b[0] = 2 * a;
return b[0];
}
}

An exception will occur

Answer

Correct Answer: 4

Note: This Question is unanswered, help us to find answer for this one

574.
Can the constructor of a class be made private?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

575.
What is true regarding the User Datagram Protocol (UDP)?

A message is never partial

Messages order is guaranteed

Messages are not guaranteed to arrive at destination

UDP is MTU independant

Answer

Correct Answer: A message is never partial
Messages are not guaranteed to arrive at destination

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

576.
is true regarding the socket API?

All socket API classes and methods are endian independant

The socket API can be used with UNIX sockets

The socket API cannot be used with UDP, only TCP

None of them is true

Answer

Correct Answer: None of them is true

Note: This Question is unanswered, help us to find answer for this one

577.
Is the following statement true or false?

A .java file without any source code is a valid java file.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

578.
Which of the following statements is true of the HashMap class?

It stores information as key/value pairs

Elements are returned in the order they were added

It does not permit null keys

It does not permit null values

Answer

Correct Answer: It stores information as key/value pairs

Note: This Question is unanswered, help us to find answer for this one

579.
What should be the replacement of "//ABC" in the following code?

class Krit
{
    String str= new String("OOPS !!! JAVA");
    public void KritMethod(final int iArgs)
    {
      int iOne;
      class Bicycle
      {
        public void sayHello()
{
          //ABC
        }
      }
    }
    public void Method2()
    {
      int iTwo;
    }
}

System.out.print(str);

System.out.print(iOne);

System.out.print(iTwo);

System.out.print(iArgs);

Answer

Correct Answer: System.out.print(str);
System.out.print(iArgs);

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

580.
What is the superclass of java.net.DatagramSocket?

java.net.Socket

java.net.UDPSocket

java.net.SocketInterface

java.lang.Object

None of the above

Answer

Correct Answer: java.lang.Object

Note: This Question is unanswered, help us to find answer for this one

581.
Choose the correct statement:

A Constructor with no arguments will be the default constructor

Constructors cannot be overloaded

A call to a constructor in a parent class can only be made from within a constructor

A constructor may not be declared as private

Answer

Correct Answer: A call to a constructor in a parent class can only be made from within a constructor

Note: This Question is unanswered, help us to find answer for this one

582.
What will be the output of this program?

public class Test
{
public static void main (String args[])
{
String a, b, c, d;
a = ''Hello1234'';
b = ''Hello'' + String.valueOf(1234);
c = ''Hello'' + ''1234'';
d = new String (new char[]{'H', 'e', 'l', 'l', 'o', '1', '2', '3', '4'});
System.out.print (a == b);
System.out.print ('' '');
System.out.print (a.equals(b));
System.out.print ('' '');
System.out.print (a == c);
System.out.print ('' '');
System.out.print (a.equals(c));
System.out.print ('' '');
System.out.print (a == d);
System.out.print ('' '');
System.out.print (a.equals(d));
System.out.print ('' '');
}
}

true true true true false true

false true true true false false

false true true true false true

false false true true false true

Answer

Correct Answer: false true true true false true

Note: This Question is unanswered, help us to find answer for this one

583.
What will the length() method in the File class return?

The number of characters in the file

The number of bytes in the file

The number of lines in the file

None of the above

Answer

Correct Answer: None of the above

Note: This Question is unanswered, help us to find answer for this one

584.
What will be the output of the following program?

public class Test
{
     public static void main (String args[ ])
     {
         B o = new A ();
         System.out.println (o.content ());
     }
     public String content () throws Exception
     {
         throw new Exception (''This is an exception on this.content ()'');
     }
     private static class B
     {
       public String content ()
         {
         return ''B'';
         }
      }
      private static class A extends B
{
       public String content ()
         {
            return ''A'';
         }
      }
}

The code will compile but will fail to run

The code will compile and on running, it will print ''A''

The code will fail to compile

The code will compile and on running, it will print ''B''

Answer

Correct Answer: The code will compile and on running, it will print ''A''

Note: This Question is unanswered, help us to find answer for this one

585.
Is it possible to create an array of zero length?

YES

Answer

Correct Answer: YES

Note: This Question is unanswered, help us to find answer for this one

586. You want to call a function written in C in your Java application remotely. How will you do it?

Use IDL

Use CORBA

Use RMI

Use JDBC

Answer

Correct Answer: Use CORBA

Note: This Question is unanswered, help us to find answer for this one

587. Maintaining object semantics means:

Remote object appears same to the client machine as it does to the server machine

Remote object appears different to the client machine as it does to the server machine

Remote variable appears same to the client machine as it does to the server machine

Server object appears different to the client machine as it does to the server machine

Remote reference appears different to the client machine as it does to the server machine

Answer

Correct Answer: Remote object appears same to the client machine as it does to the server machine

Note: This Question is unanswered, help us to find answer for this one

588. Read the following JSP code snippet and answer the question based upon it:

http://www.yourcompany.com/you TagLibrary /WEB-INF/yourTagLibrary.tld

From the statements given below, which one applies to the code snippet?

The taglib directive can reference a TLD by name

This tag goes into the WEB-INF/myApplication/web.xml file

This definition is incorrect because the taglib-uri should have been uri

This definition is incorrect because the taglib should have been tag

Answer

Correct Answer: The taglib directive can reference a TLD by name

Note: This Question is unanswered, help us to find answer for this one

589. which interface provides access to request scoped attributes?

ServletContext

ServletRequest

ServletConfig

None of these

Answer

Correct Answer: ServletRequest

Note: This Question is unanswered, help us to find answer for this one

590. You want to use transaction without connecting to a database every time a page is requested. Which of the following is a suitable solution?

Synchronise doPost()

Create new connection for each transaction

Create a pool of Connection objects

Create a single connection object in the init () method and implement SingleThreadModel

Create a single connection object in the init () method and implement DoubleThreadModel

Answer

Correct Answer: Create a single connection object in the init () method and implement SingleThreadModel

Note: This Question is unanswered, help us to find answer for this one

591. Which of the following interfaces allows a servlet to set the content length and MIME type, while replying to a client?

ServletRequest Interface

ServletResponse Interface

Servlet Interface

SingleThreadModel Interface

Answer

Correct Answer: ServletResponse Interface

Note: This Question is unanswered, help us to find answer for this one

592. What is output of the following program?

class student
{
 public : int marks;
 void disp()
 {
 cout<<"its base class"
 };
 class topper:public student
 {
 public :
 void disp()
 {
 cout<<"Its derived class";
 }
 }
 void main() { student s; topper t;
 s.disp();
 t.disp();
}

Its base classIts derived class

Its base class Its derived class

Its derived classIts base class

Its derived class Its base class

Answer

Correct Answer: Its base classIts derived class

Note: This Question is unanswered, help us to find answer for this one

593. Which of the following is true about the stub object?

It can only return a value

It can only throw an exception

It can return a value or throw an exception

It returns the skel object

It does not return a value

Answer

Correct Answer: It can return a value or throw an exception

Note: This Question is unanswered, help us to find answer for this one

594. Where are victim hosts located with respect to a firewall?

In the external untrusted network

In the internal trusted network

In the DMZ

In an application proxy

In the MDZ

Answer

Correct Answer: In the DMZ

Note: This Question is unanswered, help us to find answer for this one

595. Which of the following is the correct syntax for declaring a Remote Interface?

public interface Remote { //declared methods }

public interface Remote { //empty }

public interface Remote { //constants }

interface Remote { //declared methods }

interface Remote { declared methods }

Answer

Correct Answer: public interface Remote { //empty }

Note: This Question is unanswered, help us to find answer for this one

596. What is the output of the following program?

class static_out
    {
        static int x;
     static int y;
        void add(int a , int b)
        {
            x = a + b;
            y = x + b;
        }
    }
    class static_use
    {
        public static void main(String args[])
        {
            static_out obj1 = new static_out();
            static_out obj2 = new static_out();
            int a = 2;
            obj1.add(a, a + 1);
            obj2.add(5, a);
            System.out.println(obj1.x + " " + obj2.y);
        }
  }

7 7

6 6

7 9

9 7

Answer

Correct Answer: 7 9

Note: This Question is unanswered, help us to find answer for this one

597. X.509 version 3 specifies which of the following?

A format and content for digital certificates

The IPSec standard

The Secure Socket Layer

The Data Encryption Standard

Answer

Correct Answer: A format and content for digital certificates

Note: This Question is unanswered, help us to find answer for this one

598. What is the output of the following program?

class overload
    {
        int x;
     int y;
        void add(int a)
        {
            x =  a + 1;
        }
        void add(int a, int b)
        {
            x =  a + 2;
        }
    }
    class Overload_methods
    {
        public static void main(String args[])
        {
            overload obj = new overload();
            int a = 0;
            obj.add(6);
            System.out.println(obj.x);
        }
  }

Answer

Correct Answer: 7

Note: This Question is unanswered, help us to find answer for this one

599. Which of the following is dummy reference for the client system?

Skel object

Stone object

Stub object

stub() method

skel() method

Answer

Correct Answer: Stub object

Note: This Question is unanswered, help us to find answer for this one

600. What is the output of the given program?

import java.net. *;
class networking {
      public static void main(String[] args) throws UnknownHostException {
              InetAddress obj1 = InetAddress.getByName("cisco.com");
              System.out.print(obj1.getHostName());
                }
              }

cisco

cisco.com

www.cisco.com

None of the mentioned above.

Answer

Correct Answer: cisco.com

Note: This Question is unanswered, help us to find answer for this one

601. Which of the following is a Java API for managing enterprise services, systems and networks?

JTA

Java Server Page

JMAPI

JDBC

ODBC

Answer

Correct Answer: JTA

Note: This Question is unanswered, help us to find answer for this one

602. Select the Correct Java Cryptography Architecture term for implementing security functions for the Java platform.

A.  It provides a platform and gives architecture and APIs for encryption and decryption.
B.  JCA is used by the developer to combine the application with the security measure.
C.  A programmer uses the JCA to meet the security measure.
D.  It helps in performing the third partly security rules.
E.  It uses the hash table, encryption message digest, etc. to implement the security.

A,B, and C are True Statements, whereas D and E are False Statements.

A,B, and D are True Statements, whereas C and E are False Statements.

C,D, and E are True Statements, whereas A and B are False Statements.

All the three of the above statements hold True.

Answer

Correct Answer: All the three of the above statements hold True.

Note: This Question is unanswered, help us to find answer for this one

603. Which of the following Java technologies support transaction processing?

RMI

JTS

JMAPI

JDBC

Answer

Correct Answer: JTS

Note: This Question is unanswered, help us to find answer for this one

604. JDBC is based on:

X/Open SQL Call Level Interface (CLI)

JDBC/Open CLI

Java/Open CLI

V/OPEN CLI

V/CLOSE CLI

Answer

Correct Answer: X/Open SQL Call Level Interface (CLI)

Note: This Question is unanswered, help us to find answer for this one

605. What is the output of the following program?

class string_class
    {
        public static void main(String args[])
        {
            String obj = "hello";
            String obj1 = "world";
            String obj2 = obj;
            obj2 = " world";
            System.out.println(obj + " " + obj2);
        }
    }

hello hello

world world

hello world

world hello

Answer

Correct Answer: hello world

Note: This Question is unanswered, help us to find answer for this one

606. Which of the following is the name of the cookie used by Servlet Containers to maintain session information?

SESSIONID

SERVLETID

JSESSIONID

CONTAINERID

Answer

Correct Answer: JSESSIONID

Note: This Question is unanswered, help us to find answer for this one

607. Your boss has asked you to minimize object lookups by controlling the different locations of different objects across a distributed server. Which of the following servers will you use to complete the assignment?

Centralized remote server

Centralized object server

Decentralized object server

Decentralized remote server

The Distributed server

Answer

Correct Answer: Centralized object server

Note: This Question is unanswered, help us to find answer for this one

608. What output will be sent to the browser by the following JSP code snippet?

'Que Reader' within HTML comment markers

This will cause an error

Que <%="Reader"%> within HTML comment markers

This is a comment so it is ignored by the container

Answer

Correct Answer: 'Que Reader' within HTML comment markers

Note: This Question is unanswered, help us to find answer for this one

609. RMI allows remote communication between:

C++ and Java

C and Java

Pascal and Java

Java and Java

Java and TCP/IP

Answer

Correct Answer: Java and Java

Note: This Question is unanswered, help us to find answer for this one

610. Choose True or False.

The class java.rmi.server.UnicastRemoteObject does NOT implement the java.lang.Cloneable interface.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

611. Applications can use one of two mechanisms to obtain references to remote objects. First is an application that can register its remote objects with RMI's simple naming facility, the rmiregistry. What is the second one?

An application can register its remote objects with RMI's simple naming facility, the LM_Registry

The application can pass and return remote object references as part of its normal operation

An application can register its remote objects with RMI's simple naming facility, the Localregistry

There is only one method

Answer

Correct Answer: The application can pass and return remote object references as part of its normal operation

Note: This Question is unanswered, help us to find answer for this one

612. Which of the following is incorrect about the CallableStatement interface?

CallableStatement extends PreparedStatement

CallableStatement can take input parameters as PreparedStatement

CallableStatement can use executeUpdate() method

CallableStatement can be used to execute SQL-stored procedures.

CallableStatement cannot take IN OUT parameters

Answer

Correct Answer: CallableStatement cannot take IN OUT parameters

Note: This Question is unanswered, help us to find answer for this one

613. How would you use a bean in a JSP page?

jsp:useBean name="houseLotBean" scope="response" class="session.Realestate"/

jsp:useBean id="houseLotBean" scope="session"jsp:useBean

jsp:useBean id="houseLotBean" scope="session" class="session.Realestate"/

jsp:useBean scope="session" class="session.Realestate"/jsp:useBean

Answer

Correct Answer: jsp:useBean id="houseLotBean" scope="session" class="session.Realestate"/

Note: This Question is unanswered, help us to find answer for this one

614. What is the output of the given program?

import java.io.*;
        class streams
                { public static void main(String[] args) {
                        try {
                        FileOutputStream fos = new FileOutputStream("serial");
                        ObjectOutputStream oos = new ObjectOutputStream(fos);
                        oos.writeFloat(3.5);
                        oos.flush();
                        oos.close();
                }
                catch(Exception e) {
                        System.out.println("Serialization" + e);
                        System.exit(0);
                }
                try { FileInputStream fis = new FileInputStream("serial");
                ObjectInputStream ois = new ObjectInputStream(fis);
                ois.close();
                System.out.println(ois.available());
                }
                catch (Exception e) {
                        System.out.print("deserialization");
                        System.exit(0);
                        }
            }
        }

        }

Answer

Correct Answer: 4

Note: This Question is unanswered, help us to find answer for this one

615. When a server wants to make an object available for URL lookups, it must bind that object instance to a string representing the:

File name

Object name

Variable name

Method name

Class name

Answer

Correct Answer: Object name

Note: This Question is unanswered, help us to find answer for this one

616. Choose the right syntax for a preparedStatement using ? as a placeholder for values namely CUSTOMER_ID,PRICE to be substituted while inserting values in the table ORDER:

PreparedStatement ps=con.prepareStatement("INSERT INTO ORDER (CUSTOMER_ID ,PRICE) VALUES(?,?)");

ps.clearParameters(); ps.setInt(1,3); ps.setDouble(2,790.50); ps.executeUpdate(sql);

ps.clearParameters(); ps.setInt(1,3); ps.setDouble(2,790.50); ps.executeUpdate();

ps.clear(); ps.setInt(1,3); ps.setDouble(2,790.50); ps.executeUpdate(sql);

ps.clearParameters(); ps.setInt(1,3.09); ps.setDouble(2,790.50); ps.execute(sql);

ps.clearParameters(); ps.setInt(1,3.09); ps.set(2,790.50); ps.execute(sql);

Answer

Correct Answer: ps.clearParameters(); ps.setInt(1,3); ps.setDouble(2,790.50); ps.executeUpdate();

Note: This Question is unanswered, help us to find answer for this one

617. Which design pattern is used to decouple presentation from core data access functionality in JSP?

BusinessDelegate

DataAccess Object

Model-View-Controller

Value Object

Answer

Correct Answer: Model-View-Controller

Note: This Question is unanswered, help us to find answer for this one

618. Which of the following is not required while you are developing a bean?

Implementation of Serializable

Default constructor

Introspection ability

Implementation of SingleThreadModel

Answer

Correct Answer: Implementation of SingleThreadModel

Note: This Question is unanswered, help us to find answer for this one

619. Which of the following statements is/are correct about an rmic compiler?

1. It generates stub and skeleton class files using the Java Remote Method Protocol.
2. It generates stub and tie class files for remote objects by using the Internet Inter-Orb protocol (IIOP).

Only statement 1 is correct.

Only statement 2 is correct.

Both statements 1 and 2 are correct.

Neither statement 1 nor 2 is correct.

Answer

Correct Answer: Both statements 1 and 2 are correct.

Note: This Question is unanswered, help us to find answer for this one

620. Which of the following describes the Singleton pattern correctly?

This pattern creates an object without exposing the creation logic to the client and refer to newly created object using a common interface.

In this pattern, an interface is responsible for creating a factory of related objects without explicitly specifying their classes.

This pattern involves a single class which is responsible to create an object while making sure that the only single object gets created.

This pattern is used when we want to pass data with multiple attributes in one shot from client to the server.

Answer

Correct Answer: This pattern involves a single class which is responsible to create an object while making sure that the only single object gets created.

Note: This Question is unanswered, help us to find answer for this one

621. What are the authentication mechanisms used to secure web applications?

A.  Http Basic authentication
B.  Form-based authentication
C.  Digest authentication

A and C are True Statements, whereas B is a False Statement.

B and C are True Statements, whereas B is a False Statement.

All the three of the above Statements hold True.

None of the above Statements.

Answer

Correct Answer: All the three of the above Statements hold True.

Note: This Question is unanswered, help us to find answer for this one

622. You want to access the database directly without using any additional software except Java. Which type of driver will you use?

JDBC-ODBC Bridge Driver

Native-API /Partly-Java Driver

Net-Protocol /All-Java Driver

Native-Protocol /All-Java Driver

Native-Protocol /Part-Java Driver

Answer

Correct Answer: Native-Protocol /All-Java Driver

Note: This Question is unanswered, help us to find answer for this one

623. JDBC 2.0 API has the ability to create scrollable ResultSet. Which of the following will create the same?

Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeQuery("SELECT CUS_NAME,PRICE FROM CUSTOMER");

Statement st=con.createStatement(ResultSet.TYPE_SCROLL,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeQuery("SELECT CUS_NAME,PRICE FROM CUSTOMER");

Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,srs.CONCUR_READ_ONLY); ResultSet srs=st.executeQuery("SELECT CUS_NAME,PRICE FROM CUSTOMER");

Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeUpdate("SELECT CUS_NAME,PRICE FROM CUSTOMER");

Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeUpdate("SELECT CUS_NAME, CUSTOMER");

Answer

Correct Answer: Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeQuery("SELECT CUS_NAME,PRICE FROM CUSTOMER");

Note: This Question is unanswered, help us to find answer for this one

624. Which of the following describes the Flyweight pattern correctly?

This pattern allows a user to add new functionality to an existing object without altering its structure.

This pattern is used where we need to treat a group of objects in the similar way as a single object.

This pattern hides the complexities of the system and provides an interface to the client using which the client can access the system.

This pattern is primarily used to reduce the number of objects created and to decrease the memory footprint and increase performance.

Answer

Correct Answer: This pattern hides the complexities of the system and provides an interface to the client using which the client can access the system.

Note: This Question is unanswered, help us to find answer for this one

625. Your project leader has asked you to extend the transaction across multiple page requests & multiple servlets. Which of the following will you use?

Synchronise doPost()

Create new connection for each transaction

Implement session tracking and use HttpSession object to hold onto connection for each user

Create a single connection object in the init () method and implement SingleThreadModel

Synchronise doGet ()

Answer

Correct Answer: Implement session tracking and use HttpSession object to hold onto connection for each user

Note: This Question is unanswered, help us to find answer for this one

626. What is the correct syntax of object binding to URL?

java.rmi.URL.bind ("name", object);

java.rmi.Naming.rebind ("name", object);

java.net.Naming.rebind ("name", object);

java.net.URL.bind ("name", object);

java.net.Naming.bind ("name", class);

Answer

Correct Answer: java.rmi.Naming.rebind ("name", object);

Note: This Question is unanswered, help us to find answer for this one

627. You have made a small change to one of your classes. It compiles and RMIC works, but the application shows an error when run. What is the solution?

Shut down and restart rmi

Shut down and restart rmic

Shut down and restart rmiregistry

Answer

Correct Answer: Shut down and restart rmiregistry

Note: This Question is unanswered, help us to find answer for this one

628. Which of the following is true about rmic?

It is a hybrid of java and javac commands

It is a javac command

It is a hybrid of java and RMI commands

It is a hybrid of RMI and javac commands

It is a hybrid of java and C commands

Answer

Correct Answer: It is a hybrid of java and javac commands

Note: This Question is unanswered, help us to find answer for this one

629. The doGet method is used to handle GET, conditional GET and HEAD requests. By default, which of the following error numbers is returned by this method?

404

400

444

500

200

Answer

Correct Answer: 400

Note: This Question is unanswered, help us to find answer for this one

630. In which directory do you place servlet class files?

WEB-INF\servlets

webapp\servlets

WEB-INF\classes

WEB-INF\library

Answer

Correct Answer: WEB-INF\classes

Note: This Question is unanswered, help us to find answer for this one

631. Imagine you are given 10,000 files, each containing 1 Million integers. Below is the Code which wil sum all of them and give the final result. Will the below mentioned code compiles and throws output?
public getSum(String[] file_names) {
    int sum = 0;
   for(String f: file_names) {
    sum = sum + sumOfFile(f);
   }
  return sum;
}

YES

Answer

Correct Answer: NO

Note: This Question is unanswered, help us to find answer for this one

632. How can you make callbacks if the client is behind the firewall?

By using arbitrary socket

Using trusted socket

It is not possible

Only possible in case of applets

Using packet filters

Answer

Correct Answer: It is not possible

Note: This Question is unanswered, help us to find answer for this one

633. Select the correct statement which defines that the Purpose of load balancing is to:

A.  optimize the resource usage(Avoid overload and under-load of any machines).
B.  achieve the maximum throughput.
C.  minimize response time.

A and C are True Statements, whereas B is a False Statement.

B and C are True Statements, whereas B is a False Statement.

All the three of the above Statements hold True.

None of the above Statements.

Answer

Correct Answer: All the three of the above Statements hold True.

Note: This Question is unanswered, help us to find answer for this one

634. A remote object makes itself available to the world using:

java.rmi.server.UnicastRemoteObject

java.rmi.Remote

java.rmi.server.RemoteObject

java.rmi.UnicastRemoteObject

java.rmi.BicastRemoteObject

Answer

Correct Answer: java.rmi.server.UnicastRemoteObject

Note: This Question is unanswered, help us to find answer for this one

635. Suppose you had a servlet that simply returned an error message because that resource was forbidden to that user. Read the following code snippet:

1. public void service(HttpServletRequestrequest,
2. HttpServletResponseresponse)
3. throws ServletException, IOException
4. {
5.
6. }

What code would you type on line 5 to return an error message to the requesting client?

response.sendError(HTTPServletResponse.SC_FORBIDDEN,"Error");

response.setStatus(HTTPServletResponse.SC_FORBIDDEN,"Error");

response.sendError(Response.SC_FORBIDDEN,"Error");

response.setStatus(SC_FORBIDDEN);

Answer

Correct Answer: response.sendError(HTTPServletResponse.SC_FORBIDDEN,"Error");

Note: This Question is unanswered, help us to find answer for this one

636. In case of remote method call, remote objects are passed by:

Value

Reference

Fertilizable object

Value or reference

Class

Answer

Correct Answer: Reference

Note: This Question is unanswered, help us to find answer for this one

637. Which of the following is the correct syntax of init() method in Servlet Interface?

public abstract void init(ServletConfig cof) throws ServletException

private abstract void init(ServletConfig cof)

private void init() throw ServletException

public void init(ServletConfig cof) throw ServletException

private init(ServletConfig) throws ServletException

Answer

Correct Answer: public abstract void init(ServletConfig cof) throws ServletException

Note: This Question is unanswered, help us to find answer for this one

638. You want to send transient data after serializing it. How will you do it?

Implement serializable interface

Extend Externalizable

Implement Externalizable interface

Implement Serializable,Exteranlizable interface

It is not possible

Answer

Correct Answer: It is not possible

Note: This Question is unanswered, help us to find answer for this one

639. What will you do to flag an object as a remote object?

Implement java.net.Remote interface

Implement an interface that extends java.net.Remote interface

Implement an interface that extends java.rmi.RemoteObject interface

Implement java.rmi.Remote interface

Implement an interface that extends java.rmi.Remote interface

Answer

Correct Answer: Implement an interface that extends java.rmi.Remote interface

Note: This Question is unanswered, help us to find answer for this one

640. Which of the following statements is correct about declaration of a remote interface, RemoteTrain?

public interface RemoteTrain extends java.rmi.Remote

public class RemoteTrain extends java.rmi.Remote

public interface RemoteTrain extends java.net.Remote

public class RemoteTrain extends java.net.Remote

private class RemoteTrain extends java.net.Remote

Answer

Correct Answer: public interface RemoteTrain extends java.rmi.Remote

Note: This Question is unanswered, help us to find answer for this one

641. Which of the following JDBC methods is used to retrieve BLOB data?

getBinaryStream()

getText()

getAsciiStream

getString()

getUniStream()

Answer

Correct Answer: getBinaryStream()

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642. Select the Correct security features and APIs provided in Java SE?

A.  Java Authentication and Authorization Service (JAAS)
B.  Java Generic Security Services (JGSS)
C.  Java Cryptography Extension (JCE)
D.  Java Secure Sockets Extension (JSSE)
E.  Simple Authentication and Security Layer (SASL)

A, B, and C are True Statements, whereas D and E are False Statements.

A, B, and D are True Statements, whereas C and E are False Statements.

C, D, and E are True Statements, whereas A and B are False Statements.

All the three of the above Statements hold True.

Answer

Correct Answer: All the three of the above Statements hold True.

Note: This Question is unanswered, help us to find answer for this one

643. The Java RMI registry, by default, runs on TCP port 1099. Which of the following is the correct command to start the RMI registry on a different port such as 2005?

run registry_rmi 2005

start rmiregistry 2005

run rmiregistry 2005

start rmi-registry.2005

Answer

Correct Answer: start rmiregistry 2005

Note: This Question is unanswered, help us to find answer for this one

644. Which method is called by the servlet container just after the servlet is removed from service?

public void finalize() {// code...}

public void destroy() {// code...}

public void destroy() throws ServletException {// code...}

public void finalize() throws ServletException {// code...}

Answer

Correct Answer: public void destroy() {// code...}

Note: This Question is unanswered, help us to find answer for this one

645. Which of the following is/are contained in a Java security policy file?

Granted entries

Trusted code

Aliases and their public keys

Digital certificates

Answer

Correct Answer: Granted entries

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646. Which of the following is true about a remote object?

Stub object performs business logic

Stub object perform networking routine

Skel object performs business logic

Skel object perform networking routine

Stub object does not perform networking routine

Answer

Correct Answer: Stub object perform networking routine

Note: This Question is unanswered, help us to find answer for this one

647. Find the output of the following program:

class education
{
 char name[10];
 public : disp()
 {
 cout<<"Its education system";
 }
 class school:public education
 {
 public: void dsip()
 {
 cout<<"Its school education system";
 }
 };
 void main()
 {
 school s;
 s.disp();
 }
}

Its school education system

Its education system

Its school education systemIts education system

Its education systemIts school education system

Answer

Correct Answer: Its school education system

Note: This Question is unanswered, help us to find answer for this one

648. Which among the following would destroy the encapsulation mechanism if it was allowed in the programming?

Using access declaration for the private members of base class.

Using access declaration for the public members of base class.

Using access declaration for a local variable of the main() function.

Using access declaration for the global variables.

Answer

Correct Answer: Using access declaration for the private members of base class.

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649. Which of the following describes the Filter pattern correctly?

This pattern builds a complex object using simple objects and using a step by step approach.

This pattern refers to creating a duplicate object while keeping the performance in mind.

This pattern enables developers to filter a set of objects using different criteria and chaining them in a decoupled way through the logical operations.

This pattern is used when we need to decouple an abstraction from its implementation so that the two can vary independently.

Answer

Correct Answer: This pattern refers to creating a duplicate object while keeping the performance in mind.

Note: This Question is unanswered, help us to find answer for this one

650. Which of the following occurs first in the object oriented development cycle?

Object Oriented analysis

Object generation

Problem statement

Development testing

Object inheritance

Answer

Correct Answer: Problem statement

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651. Choose the correct statement.

A. Scaling Up
This involves adding more resources to the existing nodes. For example, adding more RAM, Storage or processing power.

B. Scaling Out
This involves adding more nodes to support more users.

A is a True Statement, whereas B is a False Statement.

B is a True Statement, whereas A is a False Statement.

Both the above Statements hold True.

None of the above Statements.

Answer

Correct Answer: Both the above Statements hold True.

Note: This Question is unanswered, help us to find answer for this one

652. What is the output of the following code?

class San
{
public void m1 (int i,float f)
{
  System.out.println(" int float method");
}

public void m1(float f,int i);
  {
  System.out.println("float int method");
  }

  public static void main(String[]args)
  {
    San s=new San();
        s.m1(20,20);
  }
}

int float method

float int method

compile time error

run time error

Answer

Correct Answer: compile time error

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653. Which of the following options is a valid JSP expression?

%! String name="Patricia" %

%! String name="Patricia"; %

%=(new java.util.Date()).toLocaleString() %

% public String name="Devyn"; %

Answer

Correct Answer: %=(new java.util.Date()).toLocaleString() %

Note: This Question is unanswered, help us to find answer for this one

654. What is the output of the given program?

import java.net.*;

    class networking {
        public static void main(String[] args) throws UnknownHostException {

            InetAddress obj1 = InetAddress.getByName("cisco.com");
            InetAddress obj2 = InetAddress.getByName("inputoutput.com");
            boolean x = obj1.equals(obj2);
            System.out.print(x);
        }
    }

True

False

Answer

Correct Answer: False

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655. Which design pattern did technical designers of JSP use to provide centralized dispatching of requests via a controller servlet?

Model-view-Controller

Facade

Server-Client

Publish-Subscribe

Answer

Correct Answer: Model-view-Controller

Note: This Question is unanswered, help us to find answer for this one

656. To load a servlet repeatedly, which of the following objects will be used?

ClassDescriptor

custom ClassLoader object

ClassAnalyzer object

Class object

Answer

Correct Answer: custom ClassLoader object

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657. Which of the following connection methods is/are provided by JDBC to create statements with a desired ResultSet?

createStatement(int RSType, int RSConcurrency);

prepareStatement(String SQL, int RSType, int RSConcurrency);

prepareCall(String sql, int RSType, int RSConcurrency);

None of the above

Answer

Correct Answer: createStatement(int RSType, int RSConcurrency);

Note: This Question is unanswered, help us to find answer for this one

658. Which of the following terms supports object reuse?

Class Inheritance

Object Composition

Java Beans

Attributes

Answer

Correct Answer: Class Inheritance

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659. Which statement is correct about ServletContextListner?

An object that implements a context listener is notified when its request objects are created or destroyed

An object that implements a context listener is notified when its Web App context is created or destroyed

An object that implements a context listener is notified when its Web App deployement descriptor defines it to be notified

An object that implements a context listener is notified when its sessions are created or destroyed

Answer

Correct Answer: An object that implements a context listener is notified when its Web App context is created or destroyed

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660. Callbacks have two main limitations. The first is that only that server to which the client has already connected can call methods in a remote client object. The second is:

Object servers can get remote object references only as method parameters or return values

Remote servers can get remote object references only as method parameters or return values

Object servers can get remote object references only as method parameters

Remote servers can get remote object references only as method parameters

Remote clients can get remote object references only as method parameters

Answer

Correct Answer: Object servers can get remote object references only as method parameters or return values

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661. Clustering is used in many types of servers for high availability. Select the correct statement definition used in Clustering.

A. App Server Cluster
An app server cluster is a group of machines that can run an application server that can be reliably utilized with a minimum of down-time.
B. Database Server Cluster
An database server cluster is a group of machines that can run a database server that can be reliably utilized with a minimum of down-time.

A is a True Statement, whereas B is a False Statement.

B is a True Statement, whereas A is a False Statement.

Both the above Statements holds True.

None of the above Statements.

Answer

Correct Answer: Both the above Statements holds True.

Note: This Question is unanswered, help us to find answer for this one

662. Which of the following statements are true regarding the structure of a Web Archive file?

It has a jar extension

It is a JAR archive of the WebApplication structure

It has a war extension

It is extracted by the container upon the first call to any servlet it contains

Answer

Correct Answer: It is a JAR archive of the WebApplication structure

Note: This Question is unanswered, help us to find answer for this one

663. Servlet developers should avoid using JDBC-ODBC bridge driver because:

Drivers are bundled with JDK

Driver's native code can crash the entire server

Drivers are insecure

Drivers are of Type-1

Drivers are of Type -2

Answer

Correct Answer: Driver's native code can crash the entire server

Note: This Question is unanswered, help us to find answer for this one

664. How many instances of String Object are created in the following line of code? String a = "b" + "c"

Answer

Correct Answer: 3

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665. public void myMethod(String... strings){ // method body } Which call of myMethod() is not correct?

myMethod({"a", "b", "c"});

myMethod(new String[]{"a", "b", "c"});

myMethod();

myMethod("one", "two", "three");

Answer

Correct Answer: myMethod({"a", "b", "c"});

Note: This Question is unanswered, help us to find answer for this one

666. It is useful to have a private constructor in a java object ?

Used to construct a singleton

This is completely unnecessary and it is not allowed with java

No, and you can't intance any object with it

Answer

Correct Answer: Used to construct a singleton

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667. Which of these operators is used to allocate memory for an object?

super();

this

new

Answer

Correct Answer: new

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668. You have the following method, which throws an unchecked exception public boolean testArg(Integer n) throws IllegalArgumentException { if (n == null) throw new IllegalArgumentException(); /* ... */ } Is this throw specification correct?

No, you never specify exceptions in Java.

Yes. You need not specify an unchecked exception, but you are allowed to do so.

Yes, you must specify all exceptions thrown by a method, checked and unchecked.

No, it gives a compile error, because you are not allowed to specify an unchecked exception.

Answer

Correct Answer: Yes. You need not specify an unchecked exception, but you are allowed to do so.

Note: This Question is unanswered, help us to find answer for this one

669. Which of these statements is TRUE for enums:

Enum can implement an interface.

Enum can extend another enum.

All of the above.

Enum can extend a class.

Answer

Correct Answer: Enum can implement an interface.

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670. public @interface A { String value(); } How would you change the "value" element declaration to give it an empty String as its default?

String value() {return "";};

String value(default="");

String value() default "";

String value("");

String value() = "";

Answer

Correct Answer: String value() default "";

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671. The default constructor of an enum type is implicitly:

public

protected

private

Answer

Correct Answer: private

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672. Add this annotation to your annotation declaration in order to ensure it's available for reflection.

@Target("RUNTIME")

@Reflectable

@Retention(RetentionPolicy.RUNTIME)

@Runtime

@Retention(RetentionPolicy.REFLECTION)

Answer

Correct Answer: @Retention(RetentionPolicy.RUNTIME)

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673. Hibernate code: @Entity public class Foo{ String key; @Id public String getId() { return id; } public void setId(String id) { this.id = id; } } In the above code, Will be executed successfully?

No, there is an error in hibernate and generates an exception

Yes

Missing an annotation

It will not compile

Answer

Correct Answer: No, there is an error in hibernate and generates an exception

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674. byte a = 64; byte b = (byte) (a << 2); What is the value of b?

256

128

-1

Answer

Correct Answer: 0

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675. Output of Program byte i; for(i=0;i<128;i++) System.out.print(i);

error:byte can not used in for loop

Infinite loop

print 1234......127

print 1234......128

Answer

Correct Answer: Infinite loop

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676. Of the following, which is not a java.lang Class?

StringBuffer

StringBuilder

Void

Math

Arrays

Answer

Correct Answer: Arrays

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677. What will be the output of following Java code: int someVariable = 10_000; int someAnotherVar = 10000; if(someVariable == 10000){ System.out.println("equal"); } else{ System.out.println("not equal"); }

Run time error

Runs successfully and prints

Compile time error

Answer

Correct Answer: Runs successfully and prints

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678. such construct in Java: class Foo { { // some code } }

is another way to define the constructor

is an instance initializer, additional to constructor and called after it

is not proper, doesn't exist in Java

is a class initializer, for a static fields initialization

is an instance initializer, additional to constructor and called before it

Answer

Correct Answer: is an instance initializer, additional to constructor and called before it

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679. When using swing, which of the following is NOT a method on a JCheckBox object?

checkb.isSelected();

checkb.setSelected(state);

checkb.addListener(Listener);

checkb.addItemListener(item-listener);

Answer

Correct Answer: checkb.addListener(Listener);

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680. Java is a pure object oriented language. true or false?

false

true

Answer

Correct Answer: false

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681. public class SomeClass { public static void main(String[] args) { System.out.println(null); } } Does this code compile without errors?

Yes

Answer

Correct Answer: No

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682. By which method does Java pass data?

Pass by reference only.

Pass by value only.

Both pass by reference and pass by value.

Answer

Correct Answer: Pass by value only.

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683. What is the difference between an inner class and a nested class?

A nested class is any class that is defined within another class. An inner class is a non-static nested class.

An inner class is any class that is defined within another class. A nested class is an abstract inner class.

A nested class is any class that is defined within another class. An inner class is a static nested class.

There is no difference; they are synonymous.

Answer

Correct Answer: A nested class is any class that is defined within another class. An inner class is a non-static nested class.

Note: This Question is unanswered, help us to find answer for this one

684. In Java, "const" is:

a regular java keyword

a reserved but unused keyword

not a java keyword

Answer

Correct Answer: a reserved but unused keyword

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685. Can a constructor be final?

Yes

Answer

Correct Answer: Yes

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686. Is it possible to start a thread twice?

Yes

Answer

Correct Answer: No

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687. What's the worst-case complexity of the function Arrays.sort(int[])?

O(n*log(n))

O(n^2)

O(n)

O(2^n)

Answer

Correct Answer: O(n^2)

Note: This Question is unanswered, help us to find answer for this one

688. How many bytes are in a long in Java?

Answer

Correct Answer: 8

Note: This Question is unanswered, help us to find answer for this one

689. Can you overload a static method signature?

Yes

Answer

Correct Answer: Yes

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690. A nested class declared inside a block (a local class) can access other variables defined in its immediately enclosing scope, but only when they are:

primitives

final

public

declared before the class

initialized

Answer

Correct Answer: final

Note: This Question is unanswered, help us to find answer for this one

691. Which of the following statements are true?

(-1 >>> 1) == Integer.MAX_VALUE

(-1 >> 1) == Integer.MAX_VALUE

(1 <<< 31) == Integer.MAX_VALUE

(1 >>> 1) == Integer.MAX_VALUE

(1 << 31) == Integer.MAX_VALUE

Answer

Correct Answer: (-1 >>> 1) == Integer.MAX_VALUE

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692. A subclass's constructor will always implicitly call its superclass's default, no-argument constructor except when:

The superclass is abstract.

The subclass defines additional constructors to its default, no-argument constructor.

The subclass constructor in question makes an explicit call to another of its superclass's constructors.

The superclass defines additional constructors to its default, no-argument constructor.

Answer

Correct Answer: The subclass constructor in question makes an explicit call to another of its superclass's constructors.

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693. Java annotations. Which is not a predefined annotation type?

@Inherited

@Documented

@Overload

@SuppressWarnings

@Deprecated

Answer

Correct Answer: @Overload

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694. A java.util.ConcurrentModificationException can be thrown in a mono-threaded application.

True

False

Answer

Correct Answer: True

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695. True or false? StringBuilder is Thread-safe.

True

False

Answer

Correct Answer: False

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696. During execution of code inside a "synchronized" statement, threads other than the executing one are prevented from:

Acquiring any locks currently held by the executing thread

Acquiring the built-in lock associated with the object referenced by the synchronized statement

Accessing members of the object referenced by the synchronized statement

Making progress until the executing thread exits the block

Answer

Correct Answer: Acquiring the built-in lock associated with the object referenced by the synchronized statement

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697. package P; public class A { int m; }; Who has access to member `m'?

class A, classes from package P

Any class

class A only

class A, subclasses of A

class A, subclasses of A, classes from package P

Answer

Correct Answer: class A, classes from package P

Note: This Question is unanswered, help us to find answer for this one

698. If x is a byte and y is a double, what is an acceptable type for variable z in this expression? z = (short) x/y * 2;

Long

Int

Byte

Short

Double

Answer

Correct Answer: Double

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699. What is the result when you compile and run the following code? public class Test { public void method() { for(int i = 0; i < 3; i++) { System.out.print(i); } System.out.print(i); } }

0122

0123

None of these

Compilation error

Answer

Correct Answer: Compilation error

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700. boolean b = 1 > 0 ? 1 < 0 : false; What is the value of b?

false

true

The code will not compile.

Answer

Correct Answer: false

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701. Which one of the following statements is false?

An abstract class may have a no-argument constructor.

An abstract class may implement an interface without defining any of its methods.

An abstract class cannot implement an interface.

You can have member variables in an abstract class.

Answer

Correct Answer: An abstract class cannot implement an interface.

Note: This Question is unanswered, help us to find answer for this one

702. What is the difference between static inner class and a non static inner class?

A static inner class has no reference to its parent class, a non static inner class does.

A static inner class can only have static methods, an inner class may have non static methods.

A static inner class has no difference from a non static inner class.

An inner class has no reference to its parent class, a static inner class does.

Answer

Correct Answer: A static inner class has no reference to its parent class, a non static inner class does.

Note: This Question is unanswered, help us to find answer for this one

703. What are the minimum and maximum values of a byte?

-128 and 127

-255 and 256

-8 and 7

This depends on the Java Virtual Machine implementation.

-127 and 128

Answer

Correct Answer: -128 and 127

Note: This Question is unanswered, help us to find answer for this one

704. Which of the following APIs is used to create secure socket connections and manage digital certificates?

Servlet

JTAPI

JSSE

JNDI

Answer

Correct Answer: JSSE

Note: This Question is unanswered, help us to find answer for this one

705. What is one of the benefits of Generics in Java?

Enforcement of better Casting at Complie time

Easy handling of ClassCastException at runtime

Elimination of Casts when getting objects from Collections

Improved Runtime type checking

Answer

Correct Answer: Elimination of Casts when getting objects from Collections

Note: This Question is unanswered, help us to find answer for this one

706. Which of the following is true about this Java snippet: String a = "hello"; String b = "hello"; boolean x = (a == b);

x is never true because you are comparing two different Objects.

An exception is thrown because you cannot compare Strings this way.

x is true because the String values are different.

x can be true because of Java String interning.

Answer

Correct Answer: x can be true because of Java String interning.

Note: This Question is unanswered, help us to find answer for this one

707. The keyword 'volatile' on a field is used in Java to:

Guarantee that the field's current value is read, not a thread-cached value.

Allow access to memory mapped devices (memory mapped I/O).

Make the compiler aware that a variable will change frequently at runtime and allow the compiler to optimize for this.

Answer

Correct Answer: Guarantee that the field's current value is read, not a thread-cached value.

Note: This Question is unanswered, help us to find answer for this one

708. Which of the following variable declarations is illegal in Java?

float myVar = 5.7f;

Double[] myVar = {1.0,2.0,2.5,2.7};

List> myVar;

List myVar;

Answer

Correct Answer: List myVar;

Note: This Question is unanswered, help us to find answer for this one

709. An Enum implicitly implements which interface?

Cloneable and Serializable

Comparable and Serializable

Observer and Listener

Iterable and Set

Set and Comparable

Answer

Correct Answer: Comparable and Serializable

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710. Which of the following can be abstract?

Static Methods

None of these

Private Methods

All of these

Constructors

Answer

Correct Answer: None of these

Note: This Question is unanswered, help us to find answer for this one

711. How do you define your own annotation type?

@define MyAnnotation { /* ... */ }

@interface MyAnnotation { /* ... */ }

@annotation MyAnnotation { /* ... */ }

@class MyAnnotation { /* ... */ }

@type MyAnnotation { /* ... */ }

Answer

Correct Answer: @interface MyAnnotation { /* ... */ }

Note: This Question is unanswered, help us to find answer for this one

712. Which of these statements is correct?

return, goto and default are keywords in the Java language

new and delete are keywords in the Java language

for, while and next are keywords in the Java language

try, catch and copy are keywords in the Java language

Answer

Correct Answer: return, goto and default are keywords in the Java language

Note: This Question is unanswered, help us to find answer for this one

713. Which of the following IS NOT a property of the equals() method?

atomic

reflexive

symmetric

transitive

Answer

Correct Answer: atomic

Note: This Question is unanswered, help us to find answer for this one

714. which of the following can cause serious system failures??

suspend()

sleep()

resume()

stop()

Answer

Correct Answer: suspend()

Note: This Question is unanswered, help us to find answer for this one

715. Which of the following classes include the getSession method used to retrieve an object that implements the HttpSession interface?

HttpServletRequest

Session Context

HttpServletResponse

SessionConfig

Answer

Correct Answer: HttpServletRequest

Note: This Question is unanswered, help us to find answer for this one

716. When is an object's finalize method called?

When System.gc() is called.

Whenever the JVM's garbage collection algorithm decides to call it.

When no references to the object exist in the application.

When the object needs to release any resources it holds.

Answer

Correct Answer: Whenever the JVM's garbage collection algorithm decides to call it.

Note: This Question is unanswered, help us to find answer for this one

717. Which JVM parameter is used to set the maximum heap memory size?

Xmx

XX:PermGemSize

Xms

Xxx

Answer

Correct Answer: Xmx

Note: This Question is unanswered, help us to find answer for this one

718. Can a HashMap contain a null key?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

719. Which of the following is false regarding a class of a JavaBeans component?

it is serializable.

it is a public class

it has a public constructor with no arguments

it is transient

Answer

Correct Answer: it is transient

Note: This Question is unanswered, help us to find answer for this one

720. Does Java provide any construct to find out the size of an object?

Yes, the sizeof operator

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

721. If I write System.exit (0); at the end of the try block, will the finally block still execute?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

722. What is the default scope of a method?

protected

public

static

package-private

private

Answer

Correct Answer: package-private

Note: This Question is unanswered, help us to find answer for this one

723. A call to System.gc() does what?

Suggests that the JVM run garbage collection to reclaim memory.

Forces the JVM to run garbage collection to reclaim memory.

Grants control of the System object to the currently executing thread.

Answer

Correct Answer: Suggests that the JVM run garbage collection to reclaim memory.

Note: This Question is unanswered, help us to find answer for this one

724. The Java Virtual Machine manages its own:

both of these

memory and allocates it as necessary.

namespace and allocates more if necessary.

none of these

Answer

Correct Answer: memory and allocates it as necessary.

Note: This Question is unanswered, help us to find answer for this one

725. find the correct output: StringBuffer fb= new StringBuffer("one two one"); int i, j ; i= fb.indexOf("one"); System.out.println(i); j= fb.LastIndexOf("one"); System.out.println(j);

1,8

0, 8

0,3

1,3

Answer

Correct Answer: 0, 8

Note: This Question is unanswered, help us to find answer for this one

726. What does a synchronized method use as a mutex in Java?

A globally declared mutex.

The method's mutex.

The owning object's (this's) mutex.

Answer

Correct Answer: The owning object's (this's) mutex.

Note: This Question is unanswered, help us to find answer for this one

727. Are static fields of a class included in serialization?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

728. public class SomeClass { public static void main(String[] args) { System.out.println(((String)null).toUpperCase()); } } What is the result of the following program?

The code throws NullPointerException.

The code prints NULL on console.

The code does not compile.

Answer

Correct Answer: The code throws NullPointerException.

Note: This Question is unanswered, help us to find answer for this one

729. Non-static attributes can be accessed without an instance of the class.

True

Only if they are private

False

Only if they are public

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

730. public class SomeClass { public static void main(String[] args) { System.out.println((String)null); } } What is the result of the following program?

The code prints "null" on console.

The code throws NullPointerException.

The code does not compile.

Answer

Correct Answer: The code prints "null" on console.

Note: This Question is unanswered, help us to find answer for this one

731. what are the parts of JNDI architecture

JNDI SPI

Java API

JNDI API and JNDI SPI

JNDI API

Answer

Correct Answer: JNDI API and JNDI SPI

Note: This Question is unanswered, help us to find answer for this one

732. Which of these is the wildcard symbol for use in generic type specification?

Answer

Correct Answer: ?

Note: This Question is unanswered, help us to find answer for this one

733. Is "main" a keyword in Java?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

734. SWING Toolkit contains

component set (subclasses of JComponent),support classes,interfaces

interfaces,component set (subclasses of JComponent)

component set (subclasses of JComponent)

support classes,interfaces

Answer

Correct Answer: component set (subclasses of JComponent),support classes,interfaces

Note: This Question is unanswered, help us to find answer for this one

735. Java interfaces can extend...

final classes.

one other interface.

nothing: extension is not valid for interfaces.

multiple interfaces.

Answer

Correct Answer: multiple interfaces.

Note: This Question is unanswered, help us to find answer for this one

736. What is the keyword to forbid the serialization of an instance field?

transient

volatile

serializable

break

synchronized

Answer

Correct Answer: transient

Note: This Question is unanswered, help us to find answer for this one

737. Which method is used to sort a Collection by natural order of its elements?

Sort.sort

Collection.sort

CollectionsUtils.sortCollection

Collections.sort

Answer

Correct Answer: Collections.sort

Note: This Question is unanswered, help us to find answer for this one

738. In Math and other java.lang Classes, generally all methods are declared _.

static

abstract

private

final

package private

Answer

Correct Answer: static

Note: This Question is unanswered, help us to find answer for this one

739. What is an abstract class?

A class with an undefined constructor

A class that does not define all of its methods

A class of methods that must be implemented

A class that is defined by another class

Answer

Correct Answer: A class that does not define all of its methods

Note: This Question is unanswered, help us to find answer for this one

740. Any source code valid for one version of Java is also valid for all previous versions of Java.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

741. Consider the following code: int i=aReader.read(); What is the true of the type of variable aReader?

It has to be a FileReader

It has to be a BufferReader.

It can neither be a FileReader or a BufferReader.

It can either be a FileReader or a BufferReader.

Answer

Correct Answer: It can either be a FileReader or a BufferReader.

Note: This Question is unanswered, help us to find answer for this one

742. Which of these keywords is used to manually clean up memory in java?

finalizeGarbageCollection

final

finalize

finally

Answer

Correct Answer: finalize

Note: This Question is unanswered, help us to find answer for this one

743. String objects in Java are immutable which means:

that, if constant, they cannot be changed once they are created.

that they can be changed one time without changing the reference.

that they can be changed multiple times without altering the reference.

Answer

Correct Answer: that, if constant, they cannot be changed once they are created.

Note: This Question is unanswered, help us to find answer for this one

744. If you override method "equals()", what other function you must override for the class to work properly?

public int hash()

public static int hash()

public int hashCode()

public static int hashCode()

Answer

Correct Answer: public int hashCode()

Note: This Question is unanswered, help us to find answer for this one

745. If you set one object variable equal to another object variable:

you end up with two copies of the data and two references to the variable.

you end up with one copy of the data and one reference to the data.

you end up with one copy of the data and two references to the data.

Answer

Correct Answer: you end up with one copy of the data and two references to the data.

Note: This Question is unanswered, help us to find answer for this one

746. Java programs must have at least one method called main() _____.

In order to compile

Both of these

In order to execute

Answer

Correct Answer: In order to execute

Note: This Question is unanswered, help us to find answer for this one

747. The foreach loop in Java is constructed as:

for (Object o : collection)

foreach (Object o : collection)

there is no foreach loop in Java

for (Object o in collection)

foreach (collection as Object o)

Answer

Correct Answer: for (Object o : collection)

Note: This Question is unanswered, help us to find answer for this one

748. Java's Reflection feature allows you to do things including (but not limited to) :

Perform pseudo-pointer manipulations in Java.

Dynamically change the Java Heap Size.

Optimize recursion at runtime by extending the reflection class.

Obtain the names of a class' members and display them at runtime.

Answer

Correct Answer: Obtain the names of a class' members and display them at runtime.

Note: This Question is unanswered, help us to find answer for this one

749. Can a non-generic class have a generic constructor?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

750. If "A" is a class, then what does the statement "A a1;" do?

The syntax is incorrect.

The statement does not do anything.

The object reference variable 'a1' should be in title case.

An object 'a1' of class 'A' is created.

The object reference variable 'a1' is declared.

Answer

Correct Answer: The object reference variable 'a1' is declared.

Note: This Question is unanswered, help us to find answer for this one

751. The "synchronized" keyword does the following

Provides a convenient shortcut for creating threads

Prohibits code from being executed during garbage collection

Aligns samples within the JVM for accuracy when profiling

Ensures that each call finishes at the same time

Prevents concurrency within methods or statements

Answer

Correct Answer: Prevents concurrency within methods or statements

Note: This Question is unanswered, help us to find answer for this one

752. What is the command to run an executable JAR file named program.jar?

java -jar program.jar

java -run program.jar

jar program.jar

java -run program

java -jar program

Answer

Correct Answer: java -jar program.jar

Note: This Question is unanswered, help us to find answer for this one

753. Which of the following is not a method in java.lang.String?

String toString()

int compareTo(String anotherString)

boolean isNull()

String valueOf(char[] data)

Answer

Correct Answer: boolean isNull()

Note: This Question is unanswered, help us to find answer for this one

754. Any valid program compiled under one version of Java...

...will generally run under previous versions of the platform.

...will generally run under future versions of the platform.

...can never run under future versions of the platform.

...can only run under that version of the platform.

Answer

Correct Answer: ...will generally run under future versions of the platform.

Note: This Question is unanswered, help us to find answer for this one

755. Can you mark an interface as final?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

756. TreeMap class is used to implement which collection interface?

List

SortedSet

Set

SortedMap

Answer

Correct Answer: SortedMap

Note: This Question is unanswered, help us to find answer for this one

757. Which Map implementation is safe for modification in a multi-threaded program?

java.util.WeakHashMap

java.util.concurrent.ConcurrentHashMap

java.util.TreeMap

java.util.LinkedHashMap

Answer

Correct Answer: java.util.concurrent.ConcurrentHashMap

Note: This Question is unanswered, help us to find answer for this one

758. Can a class be both abstract and final?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

759. output of program class Test {T obj; Test(T obj) { this.obj=obj } T getobj() {return obj; } } class RunC {public static void main(String[] ar) { Test obj=new Test("hello"); System.out.print(obj.getobj()); } }

Runtime Error

hello

Nothing display

error:class decleration not valid

Answer

Correct Answer: hello

Note: This Question is unanswered, help us to find answer for this one

760. Java allows you to specify two types of variables: primitive, which store a single value, and

neither of these

reference, where the data is accessed indirectly.

wide, which reference a double byte variable.

Answer

Correct Answer: reference, where the data is accessed indirectly.

Note: This Question is unanswered, help us to find answer for this one

761. Can we override a static method?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

762. A method is considered to be overloaded when:

they have multiple call signatures

the method throws an exception

they have different return types

You cannot overload a method

Answer

Correct Answer: they have multiple call signatures

Note: This Question is unanswered, help us to find answer for this one

763. What is displayed when the following code is compiled and executed? String s1 = new String("Test"); String s2 = new String("Test"); if (s1==s2) System.out.println("Same"); if (s1.equals(s2)) System.out.println("Equals");

Equals

Same Equals

The code compiles, but nothing is displayed upon execution.

Same

Answer

Correct Answer: Equals

Note: This Question is unanswered, help us to find answer for this one

764. ________ is when a subclass implements a method that is already provided by a superclass.

Method overloading

Object orientation overdev

Method overdriving

Method overriding

Answer

Correct Answer: Method overriding

Note: This Question is unanswered, help us to find answer for this one

765. Can you declare an abstract class with no abstract methods?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

766. How do you prevent a class from being extended by a subclass?

Declare the class as abstract.

Declare the class as final.

Declare all member variables and methods as protected.

Declare all its members as private.

Answer

Correct Answer: Declare the class as final.

Note: This Question is unanswered, help us to find answer for this one

767. Under the strictest definition, an interface may contain only:

additional pylons

abstract methods

fields

constructors

Answer

Correct Answer: abstract methods

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768. If I write return at the end of the try block, will the finally block still execute?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

769. What effect does declaring a method as final have?

The parameters passed to the method cannot be modified.

The method cannot be overridden in subclasses.

The return value of the method will be final.

The method can only accept final parameters.

Answer

Correct Answer: The method cannot be overridden in subclasses.

Note: This Question is unanswered, help us to find answer for this one

770. What company developed java?

Google

Microsoft

IBM

Facebook

Sun Microsystems (Oracle)

Answer

Correct Answer: Sun Microsystems (Oracle)

Note: This Question is unanswered, help us to find answer for this one

771. Which of the following is correct for the "main" method of a class?

public final void main(String arg0, String arg1="default") {}

public static void main(String [] args) { }

public void main(int argc, String [] argv) {}

@Main public void main(int argc, String[] argv) {}

Answer

Correct Answer: public static void main(String [] args) { }

Note: This Question is unanswered, help us to find answer for this one

772. What keyword is used to add external package members to the current Java file?

get

import

uses

using

add

Answer

Correct Answer: import

Note: This Question is unanswered, help us to find answer for this one

773. As a general syntax rule, Java is case sensitive on:

only Microsoft Windows platforms.

all platforms.

only on UNIX based platforms.

Answer

Correct Answer: all platforms.

Note: This Question is unanswered, help us to find answer for this one

774. You can use the 'static' keyword for which of the following?

Variables

Methods

All of these

Classes

Answer

Correct Answer: All of these

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775. An applet can do which of the following?

All of these

Stop running

Start running

Self initialize

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

776. Class definitions in Java can have which of the following access levels?

protected

public

all of these

private

Answer

Correct Answer: all of these

Note: This Question is unanswered, help us to find answer for this one

777. All Java files must have a .java extension and are compiled with the:

gcc compiler

system runtime compiler

javac compiler

Answer

Correct Answer: javac compiler

Note: This Question is unanswered, help us to find answer for this one

778. Which of the following is the correct signature for a main method that can be used as an entry point by the Java runtime?

public static void main(String[] args)

public void main(String[] args)

public static void main(Collection c)

public static int main(String[] args)

Answer

Correct Answer: public static void main(String[] args)

Note: This Question is unanswered, help us to find answer for this one

779. public class Dog extends Animal{ ... } is an example of...

Encapsulation

Abstraction

Inheritance

Type casting

Answer

Correct Answer: Inheritance

Note: This Question is unanswered, help us to find answer for this one

780. The varargs method: public void foo(String... strings) may be called with:

foo("bar1");

foo("bar1", "bar2");

All of these.

foo("bar1", "bar2", "bar3");

Answer

Correct Answer: All of these.

Note: This Question is unanswered, help us to find answer for this one

781. The process of changing a datatype of a value is called:

typecasting

hardcasting

datatyping

Answer

Correct Answer: typecasting

Note: This Question is unanswered, help us to find answer for this one

782. Which keywords would you use to handle exceptions in Java?

throw, take, finally

try, catch, end

throw, catch, end

try, catch, finally

throw, catch, do

Answer

Correct Answer: try, catch, finally

Note: This Question is unanswered, help us to find answer for this one

783. The correct operator for 'conditional or' is:

Answer

Correct Answer: ||

Note: This Question is unanswered, help us to find answer for this one

784. _ jumps out of an entire loop, whereas _ jumps to the next iteration.

stop; jump

stop; continue

break; jump

break; continue

Answer

Correct Answer: break; continue

Note: This Question is unanswered, help us to find answer for this one

785. When you run a Java program, the system is running the Java Runtime Engine (JRE) as an executable which then:

processes the java code through the Java Virtual Machine (JVM).

processes the java code through the native OS interpreter.

process the java code through the interpreter which is pointed to by the CLASSPATH statement.

none of these

Answer

Correct Answer: processes the java code through the Java Virtual Machine (JVM).

Note: This Question is unanswered, help us to find answer for this one

786. What are the core JMS-related objects required for each JMS-enabled application?

All of these

Within a session, the appropriate sender or publisher or receiver or subscriber objects.

A connection object provided by the JMS server (the message broker)

Within a connection, one or more sessions, which provide a contest for message sending and receiving

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

787. Do you need to explicitly define a constructor for every class?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

788. Which of these keywords is used to define packages in Java?

Package

package

pkg

pack

Pkg

Answer

Correct Answer: package

Note: This Question is unanswered, help us to find answer for this one

789. What is the proper syntax for a Java class's main method?

public void static main(String[] args)

private void main (String[] args)

public static main(String[] args)

private static void main(String[] args)

public static void main(String[] args)

Answer

Correct Answer: public static void main(String[] args)

Note: This Question is unanswered, help us to find answer for this one

790. What is the syntax for creating a class derived from the class named MyClass?

class MyDerived implements MyClass

public class MyDerived : MyClass

class MyDerived extends MyClass

Answer

Correct Answer: class MyDerived extends MyClass

Note: This Question is unanswered, help us to find answer for this one

791. A JavaBean is a special Java class:

which must be serializable so that the state can be stored.

which must have a public, no-argument constructor.

all of these

which must follow standard naming conventions for attributes such as getXxxx.

Answer

Correct Answer: all of these

Note: This Question is unanswered, help us to find answer for this one

792. Will a program run if the main() is not static?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

793. Can an interface have member variables?

No, never

Yes, as long as they are public, static and final

Answer

Correct Answer: Yes, as long as they are public, static and final

Note: This Question is unanswered, help us to find answer for this one

794. Which of the following JNDI properties provide security information?

java.naming.security.credential

java.naming.security.authentication

java.naming.security.principal

All of these

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

795. The pattern described below is known as: public class Foo{ private static Foo instance; private Foo(){ } private static getInstance(){ if (instance == null){ instance = new Foo(); } return instance; }

the Observer Pattern

the Flyweight pattern

the Singleton pattern

the Factory pattern

Answer

Correct Answer: the Singleton pattern

Note: This Question is unanswered, help us to find answer for this one

796. Are primitive data types passed by reference or passed by value?

Passed by value

Passed by reference

Answer

Correct Answer: Passed by value

Note: This Question is unanswered, help us to find answer for this one

797. Which statement is wrong?

ArrayList<String> myList = new ArrayList<String>(10);

ArrayList<String> myList = new ArrayList<String>();

ArrayList<Integer> myList = new ArrayList<Integer>();

ArrayList<Double> myList = new ArrayList<Double>();

ArrayList<String> myList = new ArrayList<Integer>();

Answer

Correct Answer: ArrayList<String> myList = new ArrayList<Integer>();

Note: This Question is unanswered, help us to find answer for this one

798. What's wrong with the following method: public static int getSize(){ int temp = super.getSize(); if(temp==0) temp=this.size; return temp; }

There is nothing wrong with this method.

static methods cannot return type "int"

static methods cannot refer to "this" or "super"

Answer

Correct Answer: static methods cannot refer to "this" or "super"

Note: This Question is unanswered, help us to find answer for this one

799. You read the following statement in a valid Java program: submarine.dive(depth); What must be true?

"depth" must be an int.

"submarine" must be a method.

"dive" must be a method.

"submarine" must be the name of a class.

"dive" must be the name of an instance field.

Answer

Correct Answer: "dive" must be a method.

Note: This Question is unanswered, help us to find answer for this one

800. Can static and abstract keywords be used together?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

801. public class A { private int m = 5; class N { private int m = 3; public void print() { System.out.println("m=" + m); } } public static void main(String[] args) { A a = new A(); N n = a.new N(); n.print(); } } What is the output?

m=5

m=3

Runtime error

Compile error

Answer

Correct Answer: m=3

Note: This Question is unanswered, help us to find answer for this one

802. What will be the output of below code String a="abc"; String b="abc"; String c=new String("abc"); if(a==c && a.equals(b)){ System.out.println("They are equal"); } else System.out.println("They are not equal");

They are not equal

They are equal

Answer

Correct Answer: They are not equal

Note: This Question is unanswered, help us to find answer for this one

803. The StringBuffer and StringBuilder classes in Java are optimized for

creating strings which change considerably.

creating strings which only change once.

retrieval of all or part of a string but not altering the string.

Answer

Correct Answer: creating strings which change considerably.

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804. The @Override annotation

All of these answers are correct

Is not required to implement an interface method.

Is not required to override an inherited method in a parent class.

Will warn you on compilation if your annotated method signature doesn't match a method in a parent class or interface.

Clearly documents the intention to override a method in a parent class or implement a method declared in an interface.

Answer

Correct Answer: All of these answers are correct

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805. Which of the following is true for interface variables.

They may exist, and they can be transient but not volatile.

They cannot exist and the compiler will throw a 'field name is ambiguous' error if you attempt to make them.

They may exist, and they can be transient and volatile.

They may exist, and they can be volatile but not transient.

They may exist, but they must be public, static and final.

Answer

Correct Answer: They may exist, but they must be public, static and final.

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806. Which method is used to force one thread to wait for another thread to finish?

stop()

sleep(long milliseconds)

yield()

join()

Answer

Correct Answer: join()

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807. Which java class provides variables local to each thread?

LocalThread

Thread

Runnable

ThreadLocal

Answer

Correct Answer: ThreadLocal

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808. If you need to determine exactly which class your object is:

use the myClass property.

use the instanceOf operator.

use the getClass() method.

Answer

Correct Answer: use the getClass() method.

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809. How do we compare enum types in java

Arithmetic comparator "=="

Equals Method

Both

Answer

Correct Answer: Both

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810. How many objects are created: String s1="String"; String s2="String"; String s3="String";

Two

Three

One

Answer

Correct Answer: One

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811. Will a program compile if the main method is defined private?

No, it does not compile

Yes, but will not run

Answer

Correct Answer: Yes, but will not run

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812. A function that defines the steps necessary to instantiate one object of that class is called:

an instantiator.

a constructor.

a destructor.

Answer

Correct Answer: a constructor.

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Java MCQs | Topic-wise

MCQ on Applet	MCQ on Basic Java
MCQ on Introduction to Java	MCQ on J2EE (Java Platform, Enterprise Edition)
MCQ on Java AWT And Swing	MCQ on Java Database Connectivity
MCQ on Java I/O Package	MCQ on Java Language Access Control And Declaration
MCQ on Java keywords	MCQ on Sun Certified Java Programmer (SCJP)
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Basic Java MCQ

1. A(n) ________ is used as an index to pinpoint a specific element within an array.

2. A(n) ____ causes a value to be sent from a called method back to the calling method.

3. A ____ consists of written steps in diagram form, as a series of shapes connected by arrows.

4. If you want all objects to share a single nonchanging value, then the field is static and ______.

5. The value of the responsetext property is almost always a(n) ____ string.

6. You use a unary minus sign preceding a value to make the value ____.

7. Methods used with object instantiations are called ____ methods.

8. A(n) ____ variable is known only within the boundaries of the method.

9. A(n) ____ loop is one that performs no actions other than looping.

10. A declaration for an enumerated type begins with the ________ key word.

11. A decision symbol in an activity diagram takes the shape of a ________.

12. If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ________.

13. ""aba"".comparetoignorecase(""abc"") returns ________.

14. Assigning ____ to a field means that no other classes can access the field?s values.

15. For ease in locating class methods, many programmers store them in ____ order.

16. By convention, a class diagram contains the ____ following each attribute or method.

17. A(n) ____ method is a method that creates and initializes class objects.

18. Class ________ represents an image that can be displayed on a jlabel.

19. A logical structure called a(n) ____ structure is when one step follows another unconditionally.

20. When you are working with a ________, you are using a storage location that holds a piece of data.

21. When an expression containing a ____ is part of an if statement, the assignment is illegal.

22. When a parameter is a(n) ______ data type, any changes made in a method are preserved.

23. To prevent a class from being instantiated, ________.

24. To guarantee that the member variables of a class are initialized, you use ____.

25. The term ________ typically refers to the device that displays console output.

26. The name of the ____ is always the same as the name of the class whose objects it constructs.

27. The iterator() method is defined in the ________ interface.

28. The conditional operator ?: takes ____ arguments.

29. The capability to inherit from more than one class is called ____.

30. Java and c++ are _____ languages.

31. If a compiler detects a violation of language rules, it refuses to translate the class to ____.

32. Fill in the code in comparable________ c = new date();

33. A sentinel value ________ and signals that there are no more values to be entered.

34. A method that is associated with an individual object is called ________.

35. You use a ____ following the closing brace of an array initialization list.

36. Whenever a method requires multiple arguments, the arguments are always separated with ____.

37. When you use the && operator, you must include a complete _____ on each side.

38. When working with logical operators, you can always use ____ to change precedence.

39. The characters ____ move the cursor to the next line when used within a println() statement.

40. Method names that begin with ____ and set are very typical.

41. Method calls cannot be distinguished by ________.

42. An if statement that appears inside another if statement is referred to as __________.

43. A(n) ____ comparison is based on the integer Unicode values of the characters.

44. From which class do all other classes implicitly extend?

45. What keyword is added to a method declaration to ensure that two threads do not simultaneously execute it on the same object instance?

46. An _ is a serious issue thrown by the JVM that the JVM is unlikely to recover from. An _ is an unexpected event that an application may be able to deal with in order to continue execution.

47. Which code checks whether the characters in two Strings,named time and money, are the same?

48. What language feature allows types to be parameters on classes, interfaces, and methods in order to reuse the same code for different data types?

49. Which statement about constructors is not ture?

50. Which choice is the best data type for working with money in Java?

51. Which language feature ensures that objects implementing the AutoCloseable interface are closed when it completes?

52. Which class does not implement the java.util.Collection interface?

53. Which class acts as root class for Java Exception hierarchy?

54. What will this code print, assuming it is inside the main method of a class?System.out.println("hello my friends".split(" ")[0]);

55. Which code snippet is valid?

56. In Java, what is the scope of a method's argument or parameter?

57. What phrase indicates that a function receives a copy of each argument passed to it rather than a reference to the objects themselves?

58. When should you use a static method?

59. Which operator is used to concatenate Strings in Java

60. How would you convert a String to an Int?

61. What type of variable can be assigned to only once?

62. Which access modifier makes variables and methods visible only in the class where they are declared?

63. Which is not a valid lambda expression?

64. Using Java's Reflection API, you can use _ to get the name of a class and _ to retrieve an array of its methods.

65. Java programmers commonly use design patterns. Some examples are the _, which helps create instances of a class, the _, which ensures that only one instance of a class can be created; and the _, which allows for a group of algorithms to be interchangeable.

66. How do you force an object to be garbage collected?

67. What kind of relationship does "extends" denote?

68. What is a valid use of the hashCode() method?

69. Which functional interfaces does Java provide to serve as data types for lambda expressions?

70. Declare and initialize an array of 10 ints.

71. Which choice is a disadvantage of inheritance?

72. Which operator would you use to find the remainder after division?

73. What language construct serves as a blueprint containing an object's properties and functionality?

74. Declare a variable that holds the first four digits of Π

75. Why are ArrayLists better than arrays?

76. Which keyword lets you use an interface?

77. Normally, to access a static member of a class such as Math.PI, you would need to specify the class "Math". What would be the best way to allow you to use simply "PI" in your code?

78. Which keyword lets you call the constructor of a parent class?

79. If you encounter UnsupportedClassVersionError it means the code was ___ on a newer version of Java than the JRE ___ it.

79. If you encounter UnsupportedClassVersionError it means the code was _ on a newer version of Java than the JRE _ it.

117. An aggregation relationship is usually represented as in _.