Question 1

What is the size of int in Java?

Accepted Answer

4 bytes

Answer

2 bytes

Answer

8 bytes

Answer

16 bytes

Question 2

Which method is used to print text in Java?

Accepted Answer

println()

Answer

output()

Answer

display()

Answer

print()

Question 3

What is the default value of a boolean in Java?

Accepted Answer

false

Answer

true

Answer

null

Answer

0

Question 4

Which of these is not a Java keyword?

Accepted Answer

pointer

Answer

interface

Answer

goto

Answer

class

Question 5

What does JVM stand for?

Accepted Answer

Java Virtual Machine

Answer

None of the above

Answer

Java Variable Method

Answer

Java Verified Method

Question 6

Which operator is used to compare two values in Java?

Accepted Answer

==

Answer

!=

Answer

<>

Answer

=

Question 7

Which of these is a primitive data type?

Accepted Answer

int

Answer

ArrayList

Answer

Object

Answer

String

Question 8

What is the range of the byte data type in Java?

Accepted Answer

-128 to 127

Answer

0 to 255

Answer

-32768 to 32767

Answer

-256 to 255

Question 9

Which statement is used to terminate a loop in Java?

Accepted Answer

break

Answer

end

Answer

stop

Answer

terminate

Question 10

Which keyword is used to define a constant in Java?

Accepted Answer

final

Answer

static

Answer

readonly

Answer

const

Question 11

How do you declare an array in Java?

Accepted Answer

int arr[];

Answer

int() array;

Answer

arr[] int;

Answer

array int arr;

Question 12

Which is not a valid access modifier in Java?

Accepted Answer

internal

Answer

protected

Answer

public

Answer

private

Question 13

What is the entry point of a Java program?

Accepted Answer

main()

Answer

start()

Answer

run()

Answer

init()

Question 14

Which keyword is used to inherit a class in Java?

Accepted Answer

extends

Answer

inherits

Answer

implements

Answer

super

Question 15

What is the purpose of the 'this' keyword?

Accepted Answer

Refer to the current object

Answer

Access the superclass

Answer

Access a class method

Answer

Call a static method

Question 16

Which method is used to find the length of a string in Java?

Accepted Answer

length()

Answer

size()

Answer

getSize()

Answer

strlen()

Question 17

What does the 'void' keyword signify?

Accepted Answer

No return value

Answer

Static method

Answer

Abstract method

Answer

Invalid method

Question 18

Which loop is used for a fixed number of iterations?

Accepted Answer

for

Answer

foreach

Answer

do-while

Answer

while

Question 19

Which package is imported by default in Java programs?

Accepted Answer

java.lang

Answer

java.util

Answer

java.io

Answer

java.net

Question 20

Which method converts a string to an integer?

Accepted Answer

parseInt()

Answer

parse()

Answer

valueOf()

Answer

toInt()

Question 21

Which of the following is a valid identifier?

Accepted Answer

_variable

Answer

variable&

Answer

1variable

Answer

void

Question 22

Which statement is used to declare a variable in Java?

Accepted Answer

int x;

Answer

x = 0;

Answer

declare int x;

Answer

initialize x;

Question 23

What is the output of 'System.out.println("Java" + 8);'?

Accepted Answer

Java8

Answer

Error

Answer

Java

Answer

8Java

Question 24

What does '==' compare in Java?

Accepted Answer

Both references and values

Answer

None of the above

Answer

References

Answer

Values

Question 25

What is the default value of a char variable?

Accepted Answer

'\0'

Answer

'a'

Answer

null

Answer

undefined

Question 26

Which method checks the length of an array?

Accepted Answer

array.length

Answer

array.length()

Answer

array.count()

Answer

array.size()

Question 27

What does 'public' keyword in a class mean?

Accepted Answer

The class can be accessed from anywhere

Answer

Only subclasses can access it

Answer

None of the above

Answer

The class can be accessed from the same package

Question 28

How do you declare a string in Java?

Accepted Answer

String str = new String("Hello");

Answer

String str = 'Hello';

Answer

char str = 'Hello';

Answer

string str = "Hello";

Question 29

Which method is used to create an object in Java?

Accepted Answer

new

Answer

new()

Answer

create()

Answer

class()

Question 30

Which data type is used to store a single character?

Accepted Answer

char

Answer

Character

Answer

int

Answer

String

Question 31

How do you create a one-dimensional array?

Accepted Answer

int arr = new int[5];

Answer

int arr = [5];

Answer

int arr = new int[];

Answer

int arr[] = new int[5];

Question 32

What is encapsulation?

Accepted Answer

Hiding implementation details

Answer

Breaking down code

Answer

Reusing code

Answer

Inheriting properties

Question 33

Which loop executes at least once?

Accepted Answer

do-while

Answer

foreach

Answer

while

Answer

for

Question 34

What is method overloading?

Accepted Answer

Two methods with the same name but different arguments

Answer

Two classes with the same methods

Answer

None of the above

Answer

A subclass method overriding a superclass method

Question 35

How do you make a class immutable?

Accepted Answer

Declare fields as final and private

Answer

Use synchronized methods

Answer

Override toString()

Answer

Use the static keyword

Question 36

Which operator is used for conditional evaluation?

Accepted Answer

?

Answer

&&

Answer

::

Answer

||

Question 37

Which method is used to read user input?

Accepted Answer

Scanner.next()

Answer

Console.read()

Answer

Input.read()

Answer

System.read()

Question 38

What is the default constructor?

Accepted Answer

A constructor without parameters

Answer

A constructor with parameters

Answer

An abstract constructor

Answer

None of the above

Question 39

How do you call a superclass constructor?

Accepted Answer

super()

Answer

parent()

Answer

this()

Answer

superclass()

Question 40

What is the keyword for defining an interface?

Accepted Answer

interface

Answer

struct

Answer

class

Answer

abstract

Question 41

How do you define a constant in Java?

Accepted Answer

Declare it with 'static final'

Answer

Declare it with 'static'

Answer

Declare it with 'const'

Answer

Declare it with 'final'

Question 42

What does the 'continue' statement do?

Accepted Answer

Skips the remaining loop

Answer

Exits the loop

Answer

Ends the program

Answer

Starts a new loop

Question 43

What is a constructor in Java?

Accepted Answer

A method that initializes an object

Answer

A method that creates an object

Answer

A static method

Answer

An overridden method

Question 44

What is polymorphism in Java?

Accepted Answer

Multiple methods with the same name

Answer

None of the above

Answer

A class inheriting another class

Answer

Hiding implementation details

Question 45

Which keyword prevents inheritance?

Accepted Answer

final

Answer

static

Answer

protected

Answer

private

Question 46

What is the output of 'System.out.println(5 + "5");'?

Accepted Answer

55

Answer

10

Answer

null

Answer

Error

Question 47

How do you sort a one-dimensional array?

Accepted Answer

Arrays.sort()

Answer

Array.sort()

Answer

None of the above

Answer

Collections.sort()

Question 48

Which keyword is used for error handling?

Accepted Answer

All of the above

Answer

throw

Answer

catch

Answer

try

Question 49

What is the output of int '5 / 2' in Java?

Accepted Answer

2

Answer

3

Answer

Error

Answer

2.5

Question 50

Which method initializes an object?

Accepted Answer

constructor

Answer

new()

Answer

init()

Answer

None of the above

Question 51

What is an abstract class in Java?

Accepted Answer

A class with abstract methods

Answer

A private class

Answer

A class without methods

Answer

A final class

Question 52

What does 'instanceof' check?

Accepted Answer

If an object is an instance of a class

Answer

If a variable is an integer

Answer

If a variable is initialized

Answer

None of the above

Question 53

What is the return type of a constructor?

Accepted Answer

No return type

Answer

Class

Answer

Object

Answer

void

Question 54

How do you define a method in Java?

Accepted Answer

void myMethod()

Answer

public method()

Answer

function myMethod()

Answer

method myMethod()

Question 55

Which method converts a primitive to its wrapper object?

Accepted Answer

valueOf()

Answer

parse()

Answer

None of the above

Answer

toPrimitive()

Question 56

What is the output of 'System.out.println("Hello" + null);'?

Accepted Answer

Hellonull

Answer

Hello

Answer

nullHello

Answer

Error

Question 57

Which class is the parent of all classes in Java?

Accepted Answer

Object

Answer

Class

Answer

Parent

Answer

Superclass

Question 58

Can a constructor be final?

Accepted Answer

No

Answer

Yes

Answer

Only in interfaces

Answer

Only in abstract classes

Question 59

Which access modifier makes a method visible only in its package?

Accepted Answer

default

Answer

private

Answer

protected

Answer

public

Question 60

What happens if no constructor is defined in a class?

Accepted Answer

The JVM provides a default constructor

Answer

The object cannot be created

Answer

The program will fail

Answer

None of the above

Question 61

What is the correct syntax for a multi-dimensional array?

Accepted Answer

Both Option 1 and Option 3

Answer

int arr[[]];

Answer

int[][] arr;

Answer

int arr[][];

Question 62

Which class provides methods for manipulating strings?

Accepted Answer

All of the above

Answer

String

Answer

StringBuilder

Answer

StringBuffer

Question 63

How do you declare a method that cannot be overridden?

Accepted Answer

Use the final keyword

Answer

Use the static keyword

Answer

Use the protected keyword

Answer

Use the private keyword

Question 64

What is method overriding?

Accepted Answer

Subclass provides its own implementation of a superclass method

Answer

None of the above

Answer

Defining multiple methods with the same name

Answer

Both of the above

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