Object Oriented Programming (OOP) Quiz # 1

The Object class is not a parent class of all the classes in java by default?

True

False

The clone() method is defined in?

Abstract class

ArrayList class

Object Class

None

The object cloning is a way to create exact copy of an object?

False

True

Which method causes the current thread to wait for the specified milliseconds, until another thread notifies? (invokes notify() or notifyAll() method)?

Protected Object clone() throws CloneNotSupportedException

Protected void finalize()throws Throwable

Public final void wait(long timeout,int nanos)throws InterruptedException

Public final void wait(long timeout)throws InterruptedException

Which class is thread-safe i.e. multiple threads cannot access it simultaneously,So it is safe and will result in an order?

None

StringBuffer class

StringBuilder class And StringBuffer class

StringBuilder class

Which method of object class can clone an object?

Object Copy()

Copy()

Clone()

Object Clone()

Generally string is a sequence of characters, But in java, string is an:

Package

Class

Object

None

In which string class function returns the number of characters in a string?

EqualIgnoreCase()

Length()

CharAt()

Replace()

How many constructors are defined in StringTokenizer class?

4

2

3

5

Which constructor creates an empty string buffer with the specified capacity as length.

None

StringBuffer(int capacity)

StringBuffer(String str)

StringBuffer()

Java defines a peer class of String, called?

StringBuffer

StringBuilder And StringBuffer

StringBuilder

None

By overriding the toString() method of the Object class, we can return values of the object, so we don't need to write much code?

False

True

In which standard collection classes implements a linked list data structure?

LinkedList

None

AbstractList

HashSet

Which method compares the given object to this object?

Public final ClassgetClass()

Public final void notify()

Public final void notifyAll()

Public boolean equals(Object obj)

This method of StringBuffer Class is used to insert the specified string with this string at the specified position?

Public String substring(int beginIndex)

Public int length()

Public synchronized StringBuffer append(String s)

Public synchronized StringBuffer insert(int offset, String s)

Which of the following is true for package access modifier?

The Class which has a Public Modifier can be accessed by all the classes from the particular package and also from different packages

The class which has private as the modifier cannot be accessed by any class even with in the package

The Class which has a Public Modifier can be accessed by all the classes from the particular package and also from different packages And The class which has private as the modifier cannot be accessed by any class even with in the package

What is dynamic dispatch?

When the function to be executed in response to a function call is determined at the end of the function call

When the function to be executed in response to a function call is determined at run-time

None

When the function to be executed in response to a function call is determined at compile-time

Constructors have to be called before the main function:

True

False

In dynamic type case a type safety check is incurred at ____________.

Run time

Compile time

Constructors never have an explicit return type.

False

True

A recursive function would result in infinite recursion, if the following were left out:

Subtraction

Base call

Recursive call

Local variable declarations

What are the major elements in an object model?

Abstraction, Encapsulation and persistence

Typing

Hierarchy, concurrency and typing

Abstraction, encapsulation and hierarchy

Common behavior can be defined in a superclass and inherited into a subclass using the ___________ keyword.

Inherits

Extend

Extends

Inherit

Which of the following is false for a destructor?

The destructor has the same name as the class

If the object was created with a new expression, then its destructor is called when the delete operator is applied to a pointer to the object

Its main purpose is to clean up and to free the resources

None

__________ allows for the separation of object interactions from classes and inheritance into distinct layers of abstraction.

Decoupling

Detaching

Loosening

Dispatching

If the child object can exist beyond the lifetime of its parent, then the relationship is ____________.

None

Composition

Generalization

Aggregation

What is a “const member function”?

None

It means the function is only a read-only function

One which always returns the same values, given the same arguments

Used for constructor and destructor

_____________ is actually a parameterized constructor which takes some parameters in order to create instance of a class.

Explicit constructor

Parameterized constructor

Implicit constructor

Virtual constructor

Can I create new operators using operator overloading?

No

Yes

Can I inherit the constructor and destructor of a base class?

Yes

No

Quiz:	Object Oriented Programming (OOP) Quiz # 1
Subject:	Object Class
Total Questions:	144 MCQs
Time:	144 Minutes