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Introduction to Java MCQ

Assigning ____ to a field means that no other classes can access the fields values.

Main

Local

Private access

Formal

Answer

Correct Answer: Private access

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A method can receive ____ arguments, even if it is defined as needing double arguments.

Integer

Methods

Memory

Final

Block

Answer

Correct Answer: Integer

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A ________ is a value that signals when the end of a list of values has been reached.

Sentinel

Count controlled

Post test

Accumulator

Answer

Correct Answer: Sentinel

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

Colons (:)

Semicolons (;)

Commas (,)

Periods (.)

Answer

Correct Answer: Commas (,)

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When you instantiate an object from a class, ____ is reserved for each instance field in the class.

Block

False

Memory

First

Answer

Correct Answer: Memory

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The signature of a method consists of ________.

Method name

Method name and parameter list

Return type, method name, and parameter list

Parameter list

Answer

Correct Answer: Method name and parameter list

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The __________ function returns the smallest integer that is greater than or equal to the number.

FLOOR

TRUNCATE

SIGN

CEILING

Answer

Correct Answer: CEILING

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The ________ properties are defined in the javafx.scene.text.text class.

Text

Underline

All of the above

Answer

Correct Answer: All of the above

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The ________ method is used to display a message dialog.

/ Comment 2 /

Input dialog

ShowMessageDialog

Double r = 2.9X106

Answer

Correct Answer: ShowMessageDialog

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The ________ loads java bytecode to the memory.

Class loader

Java compiler

Java virtual machine

Bytecode verifier

Answer

Correct Answer: Class loader

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

ParseDouble()

ReturnDouble()

ParseInt()

ParseString

Answer

Correct Answer: ParseDouble()

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The ____ method converts any object to a string.

Substring()

Replace()

ConvertString()

ToString()

Answer

Correct Answer: ToString()

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The ____ class represents more serious errors from which your program usually cannot recover.

Error

Throwable

Exception

Answer

Correct Answer: Error

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The ____ class provides the definitions for gui objects.

Control

Object

Widget

Gadget

Answer

Correct Answer: Control

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

Null

Reserve

Value

False

Answer

Correct Answer: Null

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The expression ""Java "" + 1 + 2 + 3 evaluates to ________.

Java123

Java6

Java 123

Illegal expression

Answer

Correct Answer: Java 123

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The cookie property is created with a required ____ attribute.

Value

Path

Name

Expires

Answer

Correct Answer: Name

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

Extends

Static

Base

Three

Answer

Correct Answer: Base

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

False

Input

Answer

Correct Answer: \n

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The character class ____ from java.lang.object.

Insert()

Integer

Inherits

ToString

Answer

Correct Answer: Inherits

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Static methods can only operate on ________ fields.

Global

Instance

Static

Local

Answer

Correct Answer: Static

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

That

This

SuperObject

Super

Answer

Correct Answer: Super

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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

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You can use the ________ method to replace an item at a specific location in an arraylist.

Set

Remove

Place

Add

Answer

Correct Answer: Set

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You can obtain the server's hostname by invoking ________ on an applet.

GetCodeBase().host()

GetCodeBase().getHost()

GetCodeBase().hostName()

GetCodeBase().getHostName

Answer

Correct Answer: GetCodeBase().getHost()

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

Break

Switch

Case

Answer

Correct Answer: Break

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

A 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

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You can create an arraylist using ________.

New ArrayList[]

New ArrayList[100]

New ArrayList<>()

ArrayList

Answer

Correct Answer: New ArrayList<>()

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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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Use the ________ method to write text to a web page.

Document.write()

Document.code()

Document.text()

Document.new

Answer

Correct Answer: Document.new

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

Bind.

Encapsulate.

Instantiate.

Qualify.

Answer

Correct Answer: Qualify.

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To specify a stacking order, one can use the _____ property.

Z-index

Clip: auto

Box-Sizing

Overflow

Answer

Correct Answer: Z-index

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The __________ method parses a string s to an int value.

Integer.parseInt(s);

Integer.parseInteger(s);

Integer.parseInteger(s

Answer

Correct Answer: Integer.parseInt(s);

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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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The not equal comparison operator in java is ________.

False

Answer

Correct Answer: !=

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To convert a javascript object to a json string, you use the ____ method.

ConvertToString()

Json()

Parse()

Stringify

Answer

Correct Answer: Stringify

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

Composition

Extension

Is-a

Scope

Answer

Correct Answer: Composition

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

Method

Phrase

Statement

Clause

Answer

Correct Answer: Clause

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Regarding enumerations, the ____ method returns the name of the calling constant object.

ToString

NameOf

ConstName

Ordinal

Answer

Correct Answer: ToString

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Programs that are embedded in a web page are called java ____.

Applets

Simplest

Encapsulation

Compiler

Answer

Correct Answer: Applets

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Overloaded methods always have the same _________.

Method name

Return type

Number of parameters

Order of the parameters

Answer

Correct Answer: Method name

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

Field

Class

Method

Instance

Answer

Correct Answer: Class

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

False

Variable

True

Pause

Answer

Correct Answer: Pause

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Methods that set values are called ____ methods.

Mutator

Modifier

Access

Creator

Answer

Correct Answer: Mutator

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Method calls cannot be distinguished by ________.

Return type

Class, block

Method name

The return type

Answer

Correct Answer: Return type

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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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Javascript requires _____ programming knowledge and experience as java.

Backslash

Case sensitive

The same

Slashes

Answer

Correct Answer: The same

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Java.util.vector is a subtype of ________.

Java.util.ArrayList

Java.util.LinkedList, java.util.List

Java.util.AbstractList

Java.util.Vector

Java.util.List

Answer

Correct Answer: Java.util.AbstractList
Java.util.List

Note: This question has more than 1 correct answers

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

Class, block

Color

Math.sqrt(900);

Classes

Answer

Correct Answer: Color

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Java contains a class named ____ that allows you to produce dialog boxes.

JOptionPane

Vehicle.class

Semicolon

Encapsulation

Answer

Correct Answer: JOptionPane

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Java ________ can run from a web browser.

Applications

Applets

Servlets

Micro Edition programs

Answer

Correct Answer: Applets

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It is important that the loop control ____ be altered within the body of the loop.

Infinite

Variable

Negative

Validating data

Answer

Correct Answer: Variable

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Invoking ________ returns the number of the elements in an arraylist x.

0.0, 0.5

X.get(0)

X.clear()

X.size

Answer

Correct Answer: X.size

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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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In pcdata, the ____ symbol is used to indicate a special character.

Answer

Correct Answer: $

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In order to allocate the needed memory for an object, you must use the ____ operator.

. nested

Loop

Get

New

Answer

Correct Answer: New

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

Constant

Input

Int

Answer

Correct Answer: Int

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

Variables

Literals

Key words

Comments

Answer

Correct Answer: Variables

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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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In java graphics, coordinate units are measured in ________.

Dots.

Pixels.

Points.

Inches

Answer

Correct Answer: Pixels.

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In java all output uses the ______ data type.

Int

Scan

String

Double

Char

Answer

Correct Answer: String

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In a do…while loop, the loop will continue to execute until ____.

The loop control variable is false

++score = score + 1

Event-controlled

Prefix increment operator

Answer

Correct Answer: The loop control variable is false

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

Float

Int

Char

Answer

Correct Answer: Float

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

ClassCastException

Is executed

Throwable

Answer

Correct Answer: Is executed

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

Polymorphism

Syntax

Applets

Loops

Answer

Correct Answer: Polymorphism

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

Low is 4 and high is 6

List1 is 2.5 3.1, 3.1, 6.4

Java.util.Arrays.sort(scores)

-(insertion point + 1

Answer

Correct Answer: -(insertion point + 1

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For input we will use the ______ class.

Scanner

Printer

None of these

Answer

Correct Answer: Scanner

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Exception handling helps you create ________ programs.

High-performance

Logic-error-free

Fault-tolerant

Compilation-error-free

Answer

Correct Answer: Fault-tolerant

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Every object is a _____ of a more general class.

Member

Accessor

Mutator

Method

Answer

Correct Answer: Member

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

ImageIcon

Object

SetText

Private

Answer

Correct Answer: Object

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

Secure

Private

Static

Masked

Answer

Correct Answer: Private

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

Data fields

Modifiers

Accessors

Arguments

Answer

Correct Answer: Arguments

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Character literals are enclosed in ; string literals are enclosed in .

Single quotes; double quotes

Standard output device

Identifiers can contain spaces

String concatenation operator

Answer

Correct Answer: Single quotes; double quotes

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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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Boolean values can be displayed as the words true and false with the ________ format specifier.

Answer

Correct Answer: %b

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

Prefix increment

Accumulating

Incrementing

Priming read

Answer

Correct Answer: Priming read

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Arguments to methods always appear within ________.

Brackets

Parentheses

Curly braces

Quotation marks

Answer

Correct Answer: Parentheses

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Any field declared with keyword ________ is constant.

Static

Const

Constant

Final

Answer

Correct Answer: Final

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Another name for a nonstatic member class is a(n) ____.

Comes into scope

Integer

Inner class

Reference

Answer

Correct Answer: Inner class

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A static method can ________.

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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A method must declare to throw ________.

RuntimeException

Error

Checked exceptions

Unchecked exceptions

Answer

Correct Answer: Unchecked exceptions

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

Abstract

Overloaded

Interface

Implementation

Answer

Correct Answer: Abstract

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

Parentheses

Declaration

Abstraction

Accessor

Answer

Correct Answer: Declaration

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A loop controlled by the user is a type of ____ loop.

Indefinite

Definite

Counter-controlled

Incrementing

Answer

Correct Answer: Indefinite

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A literal string is a(n) ____ object.

Anonymous

Inherits

Length()

Reference

Answer

Correct Answer: Anonymous

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A javafx action event handler is an instance of ________.

ActionEvent

Action

EventHandler

Answer

Correct Answer: EventHandler

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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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A java program is stored in an executable file called a(n) ____ file.

Exe

Class

Java

Answer

Correct Answer: Class

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A java character is stored in ________.

One byte

Two bytes

Three bytes

Four bytes

Answer

Correct Answer: Two bytes

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

Fields; object names

Fields; methods

Relationships; methods

Answer

Correct Answer: Fields; methods

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A block is enclosed inside ________.

Parentheses

Braces

Brackets

Quotes

Answer

Correct Answer: Braces

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

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Introduction to Java MCQ

Assigning ____ to a field means that no other classes can access the fields values.

A method can receive ____ arguments, even if it is defined as needing double arguments.

A ________ is a value that signals when the end of a list of values has been reached.

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

When you instantiate an object from a class, ____ is reserved for each instance field in the class.

The signature of a method consists of ________.

The __________ function returns the smallest integer that is greater than or equal to the number.

The ________ properties are defined in the javafx.scene.text.text class.

The ________ method is used to display a message dialog.

The ________ loads java bytecode to the memory.

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

The ____ method converts any object to a string.

The ____ class represents more serious errors from which your program usually cannot recover.

The ____ class provides the definitions for gui objects.

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

The expression ""Java "" + 1 + 2 + 3 evaluates to ________.

The cookie property is created with a required ____ attribute.

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

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

The character class ____ from java.lang.object.

Static methods can only operate on ________ fields.

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

You compare two strings s1 and s2 using ________.

You can use the ________ method to replace an item at a specific location in an arraylist.

You can obtain the server's hostname by invoking ________ on an applet.

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

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

You can create an arraylist using ________.

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

Use the ________ method to write text to a web page.

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

To specify a stacking order, one can use the _____ property.

The __________ method parses a string s to an int value.

The __________ method immediately terminates the program.

The not equal comparison operator in java is ________.

To convert a javascript object to a json string, you use the ____ method.

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

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

Regarding enumerations, the ____ method returns the name of the calling constant object.

Programs that are embedded in a web page are called java ____.

Overloaded methods always have the same _________.

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

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

Methods that set values are called ____ methods.

Method calls cannot be distinguished by ________.

Local variables must be ________.

Javascript requires _____ programming knowledge and experience as java.

Java.util.vector is a subtype of ________.

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

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

Java contains a class named ____ that allows you to produce dialog boxes.

Java ________ can run from a web browser.

It is important that the loop control ____ be altered within the body of the loop.

Invoking ________ returns the number of the elements in an arraylist x.

Information is passed to a method in ________.

In pcdata, the ____ symbol is used to indicate a special character.

In order to allocate the needed memory for an object, you must use the ____ operator.

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

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

In java, the word true is ________.

In java graphics, coordinate units are measured in ________.

In java all output uses the ______ data type.

In a do…while loop, the loop will continue to execute until ____.

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

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

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

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

For input we will use the ______ class.

Exception handling helps you create ________ programs.

Every object is a _____ of a more general class.

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

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

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

Character literals are enclosed in ________; string literals are enclosed in ________.

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

Boolean values can be displayed as the words true and false with the ________ format specifier.

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

Arguments to methods always appear within ________.

Any field declared with keyword ________ is constant.

Character literals are enclosed in ; string literals are enclosed in .

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