Java Interview Questions on Networking

Question: 1

public class MyClass {
public static void main(String[] args){
 int a = 10;
 System.out.println(++a++);
}
}

A. 10

B. 11

C. 12

D. Compilation Error

Question: 2

public class MyClass {
public static void main(String[] args){
 int a = 10;
 System.out.println(a++++);
}
}

A. 11

B. 12

C. 13

D. Compilation Error

Question: 3

public class CppBuzz{
public static void main(String[] args){
  int a = 10;
  System.out.println(a++);
  a++;
}
}

A. 10

B. 11

C. 12

D. 13

Question: 4

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a*a++);
}
}

A. 100

B. 110

C. 121

D. Compilation Error

Question: 5

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a++*a++);
}
}

A. 100

B. 110

C. 121

D. 144

Question: 6

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(++a*a++);
}
}

A. 121

B. 132

C. 144

D. 100

Question: 7

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(++a*++a);
}
}

A. 121

B. 144

C. 132

D. 100

Question: 8

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a*a--);
}
}

A. 100

B. 90

C. 81

D. 80

Question: 9

public class CppBuzz {
public static void main(String[] args){
 int a = 10;
 System.out.println(a--*a--);
}
}

A. 100

B. 90

C. 99

D. 72

Question: 10

public class CppBuzz {
public static void main(String[] args){
 int a = 5+5*2+2*2+(2*3);
 System.out.println(a);
}
}

A. 138

B. 264

C. 41

D. 25

Question: 11

Which of the following operators has more precedance in Java?

A. -

B. +

C. *

Question: 12

Which of the following is not an operator in Java?

A. |

B. ^

C. ~

D. <->

Question: 13

What do you mean by >>> operator in Java

A. Left Shift Operator

B. Right Shift Operator

C. Zero Fill Right Shift

D. Zero Fill Left Shift

Question: 14

Which of the following operator has more precedence?

A. ()

B. ++

C. *

D. >=

Question: 15

Which one of the following is an Unary operator in Java?

A. ()

B. *

C. +

D. ++

Question: 16

Which one of the following is Equality operator in Java?

A. >=

B. <=

C. !=

D. +=

Question: 17

Select Odd one out from these about local variables

A. Local variables are declared in methods, constructors, or blocks

B. Local variables are created when the method, constructor or block is entered

C. the variable will be destroyed once it exits the method, constructor, or block

D. We can't create reference variables of Local variables

Question: 18

On which platforms Java runs?

A. Windows

B. Mac OS

C. UNIX

D. All of these

Question: 19

Java is case sensitive langauge

A. True

B. False

Question: 20

Java program processing always starts with main() method

A. True

B. False

Question: 21

Which of these are Access Modifiers in java?

A. default

B. public

C. protected

D. All of these

Question: 22

The main() method of an application has to be public. Otherwise, it could not be called by a Java interpreter. Is that true?

A. True

B. False

Question: 23

Java supports both Primitive & Non-Primitive(User Defined) datatypes. Which one of the following is not a primitive datatype?

A. byte

B. short

C. long

D. class

Question: 24

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 break;
 }
}
}

A. 5

B. 4

C. 1

D. 0

Question: 25

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 i++;
 }
}
}

A. 5

B. 4

C. 3

D. 2

Question: 26

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 i++;
 i--;
 }
}
}

A. 5

B. 4

C. 3

D. 2

Question: 27

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 i+=2;
 }
}
}

A. 1

B. 2

C. 3

D. 4

Question: 28

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i+=2)
 {
 System.out.println("Hello");
 i+=2;
 }
}
}

A. 0

B. 1

C. 2

D. 3

Question: 29

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; )
 {
 System.out.println("Hello");
 }
}
}

A. 0

B. 1

C. 2

D. Infinite times

Question: 30

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i>5; )
 {
  System.out.println("Hello");
 }
}
}

A. 5

B. 4

C. 3

D. 0

Question: 31

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i=5 )
 {
  System.out.println("Hello");
 }
}
}

A. 5

B. 4

C. 2

D. 1

Question: 32

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 5;
  a +=5;
  
  switch(a){
   
    case 5: System.out.println("5");break;
    case 10: System.out.println("10");break;
    default: System.out.println("0");
    
  }
  
}
}

A. 5

B. 10

C. 0

D. Compilation Error

Question: 33

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 0;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");
    case 10: System.out.print("10");break;
    default: System.out.print("0");
    
  }
  
}
}

A. 5

B. 10

C. 510

D. Compilation Error

Question: 34

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 0;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");
    case 10: System.out.print("10");
    default: System.out.print("0");
    
  }
  
}
}

A. 5

B. 510

C. 5100

D. Compilation Error

Question: 35

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 0;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
    default: System.out.print("0");
    
  }
  
}
}

A. 5

B. 510

C. 5100

D. 100

Question: 36

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = -5;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
    default: System.out.print("0");
    
  }
  
}
}

A. 5

B. 10

C. 100

D. 0

Question: 37

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 5;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
    default: System.out.print("0");
    
  }
  
}
}

A. 10

B. 510

C. 5100

D. 100

Question: 38

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 5;
  a +=5;
  
 
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
             System.out.println(((a%2 ==0) ? "-even-" : "-odd-"));  
             break;

    default: System.out.print("0");
    
  }
  
}
}

A. Compilation Error

B. 10-even-

C. 10-even-0

D. 10-odd

Question: 39

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 5;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
             System.out.print(((a%2 ==0) ? "-even-" : "-odd-"));  
    default: System.out.print("0");
    
  }
  
}
}

A. Compilation Error

B. 10-even-

C. 10-odd-

D. 10-even-0

Question: 40

import java.util.Scanner;

public class CppBuzz{
  
public static void main(String[] args){
  
  String name;
  
  Scanner sc = new Scanner(System.in);
  System.out.println("Enter your name : ");
  name = sc.nextLine(); //assume if user enters 'cppbuzz'
  
  switch(name.length()){
   
    case 5: 
    case 6:
    case 7:
    case 8:
    case 9:
    case 10: System.out.print("Length is  5-10"); break;
    default: System.out.print("Length not in 5-10");
    
  }
  
}
}

A. Compilation Error

B. Length is 5-10

C. Length not in 5-10

D. nothing is printed

Question: 41

public class CppBuzz {

public static void main(String args[]) {
    
     System.out.println(""cpp'� 'buzz"");
      
    }
}

A. "cpp''buzz"

B. "cpp''buzz"

C. cpp''buzz

D. "cpp' 'buzz"

Question: 42

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a+b);
      
    }
}

A. 10"10"

B. Compilation Error

C. 20

D. 1010

Question: 43

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a-b);
      
    }
}

A. 10-10

B. 0

C. 1010

D. Compilation Error

Question: 44

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(b+a);
      
    }
}

A. 10+10

B. 1010

C. Compilation Error

D. Undefined

Question: 45

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "-10";
      
       System.out.println(a+b);
      
    }
}

A. 0

B. 10"-10"

C. 10-10

D. Compilation Error

Question: 46

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10+10";
      
       System.out.println(a+b);
      
    }
}

A. 30

B. 1020

C. 10+10+10

D. 1010+10

Question: 47

Java has 5 phases, Editing, Compilation, Loading, Verification & Execution. Which of the following unit is responsible for execution?

A. Compiler

B. Class Loader

C. Byte Code Verifier

D. Java Virtual Machine

Question: 48

What is correct sequence of execution of any Java  program?

A. Editing -> Compilation -> Class Loader -> Bytecode Verifier -> Execution

B. Editing -> Bytecode Verifier -> Compilation -> Class Loader -> Execution

C. Editing -> Compilation -> Bytecode Verifier -> Class Loader -> Execution

D. None of the above

Question: 49

package com.google.test;
import java.util.Scanner;

public class ExampleIfElse {

public static void main(String[] args){

  String s = "friends";
  int x = 0;
 
do {
  System.out.print(s.charAt(x));
  x++ ;
 } while (x < 2);

}

}

A. friends

B. friend

C. fr

D. compilation Error

Question: 50

Arrays is a group of similar type of datatype

A. True

B. False

Question: 51

Java supports single-line and multi-line comments very similar to C and C++

A. True

B. False

Question: 52

public class Main
{
public static void main(String[] args) {

               int arr[] = {1,2,3,4,5};
	    
		for(int i = 0 ; i<5; i++){ 
                   System.out.print(arr[i++]);
		}
	}
}

A. 12345

B. 123

C. 124

D. 135

Question: 53

public class Main
{
public static void main(String[] args) {
	    int arr[] = {1,2,3,4,5};
	    
		for(int i = 0 ; i<5; ){
		    System.out.print(arr[i]);
		}
	}
}

A. 12345

B. Nothing is printed

C. 1

D. Infinite times

Question: 54

public class Main
{
public static void main(String[] args) {

	    int arr[] = {1,2,3,4,5};

	    int count = 0;

		for(int i = 0 ; i<5; i++ ){
		    if(arr[i]%2==0)
		        count++;
		}
		System.out.print(count);
	}
}

A. 3

B. 2

C. 1

D. 0

Question: 55

public class Main
{
public static void main(String[] args) {
	    
            int arr[] = {1,2,3,4,5};
	    int count = 0;

		for(int i = 0 ; i<5; i++ ){
		    if(arr[i]%2==0)
		        arr[i] *= 2;
		    System.out.print(arr[i]);      
		}
		
	}
}

A. 12345

B. 135

C. 22222

D. 14385

Question: 56

public class Main
{
public static void main(String[] args) {

        int arr[] = {'a','b','c','d','e'};
	    
	for(int i = 0 ; i<5; i++){ 
            System.out.print(" " + arr[i]);
	}
    }
}

A. a b c d e

B. abcde

C. 97 98 99 100 101

D. 65 66 67 68 69

Question: 57

public class Main
{
public static void main(String[] args) {
        int arr[] = {'a','b','c','d','e'};
	    
	for(int i = 0 ; i<5; i++){ 
	    System.out.print(" "+ (char)arr[i]);
	}
}
}

A. a b c d e

B. 96 97 98 99 101

C. 65 66 67 68 69

D. None of the above

Question: 58

public class Main
{
public static void main(String[] args) {
   
     int arr[] = {'a','b','c','d','e'};
   
    System.out.print(arr);
}
}

A. abcde

B. 6566676869

C. Compilation Error

D. Some Garbage Value

Question: 59

public class Main
{
private int a;
public Main(){
            a = -10;
        }
  
public static void main(String[] args) {
	Main obj = new Main();
 	System.out.println(obj.a);
	}
}

A. 0

B. Compilation Error

C. -10

D. Garbage Value

Question: 60

public class Main
{
private int a;
public Main(){
        
    }
public Main(int temp){
        a = -10;
    }

public static void main(String[] args) {
    Main obj = new Main();
	System.out.println(obj.a);
}
}

A. -10

B. Undefined

C. Compilation Error

D. 0

Question: 61

What is default value of variable a in following code?

public class Main
{
private int a;

public static void main(String[] args) {
    Main obj = new Main();
	System.out.println(obj.a);
}
}

A. Garbage Value

B. Code has compilation error

C. null

D. 0

Question: 62

What should be value of variable a?
 public class Main
{
public static void main(String[] args) {
    int a;
    System.out.println(a);
}
}

A. Garbage Value

B. 0

C. Undefind

D. Compilation Error

Question: 63

public class Main
{
private int a;    

public Main(){
    a = 10;
}

public static void main(String[] args) {
    Main obj = new Main();
    obj.a = -10;
    System.out.println(obj.a);
}
}

A. 0

B. 10

C. -10

D. Compilation Error

Question: 64

public class Main
{

public static void main(String[] args) {
    final int a = 5;
    a = 10;
    System.out.println(a);
}

}

A. 5

B. 10

C. Error: Can't assign a value to final variable a

D. None of the above

Question: 65

public class Main
{
public static void main(String[] args) {
    final int a;
    a = 10;
    System.out.println(a);
}
}

A. 0

B. 10

C. Undefind

D. Error: Can't modify final variable a

Question: 66

public class Main
{
public static void main(String[] args) {
    final int a;
    a = 5;
    a = 10;
    System.out.println(a);
}
}

A. 5

B. 10

C. 0

D. Error: variable a might already have been assigned

Question: 67

How many times 'cppbuzz' is printed?
public class Main
{
public static void main(String[] args) {
	while(true){
	    System.out.println("cppbuzz");
		}
	}
}

A. 1

B. 2

C. Compilation Error

D. Infinite times

Question: 68

How many times 'cppbuzz' is printed?

public class Main
{
public static void main(String[] args) {
	while(false){
	    System.out.println("cppbuzz");
	}
}
}

A. 0

B. 1

C. Infinite Times

D. Error: Unreachable Statement

Question: 69

How many time 'cppbuzz' is printed?

public class Main
{
public static void main(String[] args) {
	while(true);{
        System.out.println("cppbuzz");
	}
	}
}

A. Infinite times

B. 0 times

C. 1 time

D. error: unreachable statement

Question: 70

How many times 'cppbuzz' is printed?

public class Main
{
public static void main(String[] args) {
     while(true){
       System.out.println("cppbuzz");
     break;
    }
}
}

A. Infinite times

B. 0

C. 1

D. error: unreachable statement

Question: 71

How many times 'cppbuzz' is printed?

public class Main
{
public static void main(String[] args) {
        do{
	    System.out.println("cppbuzz");
	}while(false);
	}
}

A. 0

B. 1

C. Infinite Times

D. Compilation Error

Question: 72

public class Main
{

public static void sum(int a, int b){
        System.out.print(a+b);
    }

public static void main(String[] args) {
		sum(0,0);
		sum(-1,-1);
	}
}

A. 00

B. 0-1

C. 0-2

D. -2

Question: 73

public class Main
{
    public void sum(int a, int b){
        System.out.print(a+b);
    }
    
	public static void main(String[] args) {
		sum(0,0);
		sum(-1,-1);
		
	}
}

A. -2

B. 0-1

C. 0-2

D. error: non-static method can't be called

Question: 74

public class Main
{
    public static int sum(int a, int b){
       return a+b;
    }
    
	public static void main(String[] args) {
		System.out.println(sum(sum(1,2),3));
		
		
	}
}

A. Compilation Error

B. 3

C. 5

D. 6

Question: 75

public class Main
{
    public static int sum(int a, int b){
        System.out.print(a+""+b);
        return a+b;
    }
    
    public static void main(String[] args) {
        System.out.println(sum(sum(1,2),3));		
    }
}

A. 63321

B. 36

C. 33

D. 12336

Question: 76

public class Main
{
    public static int sum(int a, int b){
       System.out.print(a+""+b);
       return a+b;
    }
    
   public static void main(String[] args) {
     System.out.println(sum(3, sum(1,2)));
  }
}

A. 32136

B. 33126

C. 12336

D. 63321

Question: 77

public class Main
{
    public static int sum(int a, int b){
       if(a+b>10)
       return 0;
       System.out.print(a+b);
       return a+b;
    }
    
	public static void main(String[] args) {
		System.out.println(sum(1, sum(0,1)));
	}
}

A. 123456789

B. 12345678

C. 122

D. None of the above

Question: 78

public class Main
{
    public static int sum(int a, int b){
       if(a+b>1)
         return 0;
       System.out.print(a+b);
       return a+b;
    }
    
    public static void main(String[] args) {
        System.out.println(sum(1, sum(0,1)));
	}
}

A. 12

B. 01

C. 11

D. 10

Question: 79

Can we call non static methods of a class by static methods of a class without creating object?

A. Yes

B. No

Question: 80

public class Main
{   
public static void main(String[] args) {
		String str = "1234";
		int a = Integer.parseInt(str);
		System.out.println(a);
	}
}

A. 123

B. 1234

C. 12340

D. Compilation Error

Question: 81

public class Main
{   
public static void main(String[] args) {
	String str = "1234.34";
	int a = Integer.parseInt(str);
	System.out.println(a);
}
}

A. 1234.34

B. 1234

C. .1234.00

D. NumberFormatException

Question: 82

public class Main
{   
public static void main(String[] args) {
		String str = "1234.34";
		Float a = Float.parseFloat(str);
		System.out.println(a);
	}
}

A. 1234.00

B. 1234.34

C. 1234

D. Exception

Question: 83

public class Main
{   
public static void main(String[] args) {
		int a = 10;
		String temp = Integer.toString(a);
		System.out.println(temp);
	}
}

A. Compilation Error

B. Exception

C. 10

D. 1

Question: 84

public class Main
{   
public static void main(String[] args) {
		int a = 10.0;
		String temp = Integer.toString(a);
		System.out.println(temp);
	}
}

A. 10.0

B. 10

C. error: loss precision

D. Exception

Question: 85

public class Main
{   
	public static void main(String[] args) {
		float a = 10.0f;
		String temp = Integer.toString(a);
		System.out.println(temp);
	}
}

A. 10.0f

B. 10.0

C. 10

D. error: no suitable method found for toString(float)

Question: 86

public class Main
{   
public static void main(String[] args) {
	float a = 10.0f;
	String temp = Float.toString(a);
	System.out.println(temp);
}
}

A. 10.0f

B. 10.0

C. 10

D. 10.00

Question: 87

public class Main
{   
public static void main(String[] args) {
	float a = 10.0000f;
	String temp = Float.toString(a);
	System.out.println(temp);
}
}

A. 10.0f

B. 10.0

C. 10.00

D. 10.0000

Question: 88

public class Main
{   
public static void main(String[] args) {
	float a = 10.0000f;
	String temp = Double.toString(a);
	System.out.println(temp);
}
}

A. 10.0000f

B. 10.0000

C. 10.00

D. 10.0

Question: 89

public class Main
{   
public static void main(String[] args) {
	String temp = "10";
	int a = Integer.parseInt(temp);
	System.out.println(a);
}
}

A. 0

B. 10

C. 100

D. Exception

Question: 90

public class Main
{   
public static void main(String[] args) {
	String temp = "10.87";
	int a = Integer.parseInt(temp);
	System.out.println(a);
}
}

A. 10

B. 10.00

C. 10.87

D. NumberFormatException

Question: 91

public class Main
{   
public static void main(String[] args) {
	String temp = "10.87";
	int a = Float.parseFloat(temp);
	System.out.println(a);
}
}

A. 10.87

B. 10.00

C. 10

D. error:possible loss of precision

Question: 92

public class Main
{   
public static void main(String[] args) {
	String temp = "10.87";
	Float a = Float.parseFloat(temp);
	System.out.println(a);
}
}

A. 10.87

B. 10.870000

C. 10.8700

D. 10.00

Question: 93

public class Main
{
public static void main(String[] args) {

	if(0==0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

A. SunMoon

B. Sun

C. Moon

D. Compilation Error

Question: 94

public class Main
{
public static void main(String[] args) {
	if(0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

A. Moon

B. Sun

C. SunMoon

D. error: int can not be converted to boolean

Question: 95

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

A. Sun

B. Moon

C. SunMoon

D. Compilation Error

Question: 96

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==1){
	    System.out.println("Sun");
	}
}
}

A. Sun

B. Nothing is printed

C. Compilation Error

D. Exception

Question: 97

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==1);{
	    System.out.println("Sun");
	}
}
}

A. Compilation Error

B. Sun

C. Nothing is printed

D. error: unreachable statement

Question: 98

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==1);
	System.out.print("Sun");
	System.out.println("Moon");
}
}

A. Compilation Error

B. exception: unreachable code

C. Sun

D. SunMoon

Question: 99

public class Main
{
public static int ret(){
    return 0;
}    
public static void main(String[] args) {
    int a = 0;
	if(ret()==0)
	System.out.print("Sun");
	System.out.println("Moon");
}
}

A. Sun

B. SunMoon

C. Nothing is printed

D. Compilation Error

Question: 100

class cppbuzz{
    private void sum(){
        System.out.println("hi");
    }
}

public class Main
{
	public static void main(String[] args) {
		cppbuzz obj = new cppbuzz();
		obj.sum();
	}
}

A. hi

B. nothing is printed

C. error: sum() has private access

D. Exception

Question: 101

class cppbuzz{
    protected void sum(){
        System.out.println("hi");
    }
}

public class Main
{
	public static void main(String[] args) {
		cppbuzz obj = new cppbuzz();
		obj.sum();
	}
}

A. hi

B. Compilation Error

C. Nothing is printed

D. Exception

Question: 102

class cppbuzz{
    public static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
		cppbuzz obj = new cppbuzz();
		obj.sum();
	}
}

A. hi

B. Compilation Error

C. Exception

D. None of the above

Question: 103

class cppbuzz{
    public static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
	    cppbuzz.sum();
	}
}

A. hi

B. Compilation Error

C. Exception

D. None of the above

Question: 104

class cppbuzz{
    protected static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
	    cppbuzz.sum();
	}
}

A. hi

B. Compilation Error

C. Exception

D. None of the above

Question: 105

class cppbuzz{
    private static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
	    cppbuzz.sum();
	}
}

A. hi

B. Compilation Error

C. Exception

D. None of the above

Question: 106

class cppbuzz{
    static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
	    cppbuzz.sum();
	}
}

A. error: sum() is private default

B. hi

C. Exception

D. Nothing is printed

Question: 107

How does below code behaves?

public class Main
{
private static void main(String[] args) {
	    
	}
}

A. Code runs but nothing is printed

B. Code runs in infinite loop

C. error: Main method not found

D. Exception

Question: 108

How many times 'facebook' is printed?

public class Main
{
public static void main(String[] args) {
    
    for(int i = 0; i<5; i++);
    {
	  System.out.println("facebook");
    }
}
}

A. 0

B. 2

C. 4

D. 5

Question: 109

public class HelloWorld
{
  public static void main(String[] args) {
	  
	char[] a = {'A', 'S', 'I', 'S', 'H'};
	
	int i = 4;
	
	do {
		System.out.print(a[i]);
		i--;
	}while (i>0);
	
	}
}

A. ASISH

B. asish

C. HSISA

D. HSIS

Question: 110

public class Main
{
public static void main(String[] args) {
    String input = " ";
    System.out.println("-"+input.trim()+"-");
}
}

A. Compilation Error

B. Exception

C. - -

D. --

Question: 111

public class Main
{
public static void main(String[] args) {
    String input = null;
    System.out.println("-"+input.trim()+"-");
}
}

A. -null-

B. - -

C. --

D. java.lang.NullPointerException

Question: 112

public class Main
{
public static void main(String[] args) {
    String input = "";
    System.out.println("-"+input.trim().trim()+"-");
}
}

A. Compilation Error

B. Exception

C. --

D. - -

Question: 113

public class Main
{
public static void main(String[] args) {
    String input = " cpp buzz chicago ";
    input = input.trim();
    System.out.println(input.length());
}
}

A. 3

B. 5

C. 18

D. 16

Question: 114

public class Main
{
public static void main(String[] args) {
    String input = " cppbuzz ";
    input = input.trim();
    System.out.print(input.length());
    input= input + " ";
    input= input + " ";
    System.out.print(input.length());
}
}

A. 77

B. 78

C. 79

D. 710

Question: 115

public class Main
{
public static void main(String[] args) {
    String input = "
cppbuzz
";
    input = input.trim();
    System.out.print(input.length());
}
}

A. 7

B. 8

C. 9

D. 10

Question: 116

public class Main
{
public static void main(String[] args) {
    String input = "the cppbuzz";
    input = input.replace("the", " ");
    input = input.trim();
    System.out.print(input.length());
}
}

A. 7

B. 8

C. 9

D. 10

Question: 117

public class Main
{
public static int i = 5;  

public static void main(String[] args) {
 decrement();
 decrement();
 decrement();
}
	
public static void decrement()
{
 System.out.print(i);
 i--;
}

}

A. 555

B. 544

C. 554

D. 543

Question: 118

Why use inheritance

A. Inheritance increases execution of program

B. Inheritance is useful in code re-usability

C. Inheritance minimizes programming loop holes

D. None of the above

Question: 119

What is 'extends' in java inheritance?

A. extends is a datatype

B. extends is a keyword

C. extends is a class

D. extend is a package

Question: 120

class Capgemini{
    private int a;
    public Capgemini(){
        a=10; 
   }
}

public class Main extends Capgemini
{
	public static void main(String[] args) {
		Main obj = new Main();
		System.out.println(obj.a);
	}
}

A. 0

B. 10

C. Compilation Error

D. Exception

Question: 121

class Capgemini{
    protected int a;
    public Capgemini(){
        a=10; 
   }
}
public class Main extends Capgemini
{
	public static void main(String[] args) {
		Main obj = new Main();
		System.out.println(obj.a);
	}
}

A. 0

B. 10

C. Compilation Error

D. Exception

Question: 122

What is the use of Garbage Collector in Java?

A. Automatic Memory Management

B. Speed-up the Execution of Java code

C. to handle runtime exceptions

D. All of these

Question: 123

If a class is 'public' then

A. It CAN be accessed from ANYWHERE

B. It CAN ONLY be accessed from ’same package’

C. It can be accessed from the same file

D. It can be access from the same project

Question: 124

How many levels of visibility Java has?

A. 1

B. 2

C. 3

D. 4

Question: 125

What is true about 'private' members of a class?

A. Private members can be accessed within a same package

B. Private members can be accessed within class only

C. Private members can be accessed within sub classes of same package

D. All of the above

Question: 126

If a class has no modifier then

A. It is visible to same project

B. It is visible to same package

C. It is visible to same file

D. All of these

Question: 127

How may main() methods are allowed in a project of Java?

A. 1

B. 2

C. 3

D. Max 256

Question: 128

In Java every data type requires some bytes of memory, How many bytes void data type requires?

A. 1

B. 2

C. 3

D. 0

Question: 129

class ITCompanies{

    private void Capgemini(){
        System.out.print("Cap ");
    }
    private void Cognizant(){
        System.out.print("Cog ");
    }
    public void func(){
        Capgemini();
        Cognizant();
    }
    public ITCompanies(){
        func();
    }
}

public class Main
{
	public static void main(String[] args) {
	      ITCompanies javaObj = new ITCompanies();
	      javaObj.func();
	}
}

A. Cap Cog

B. Cap Cap

C. Cog Cog

D. Cap Cog Cap Cog

Question: 130

class ITCompanies{

    private void Capgemini(){
        System.out.print("Cap ");
    }
    private void Cognizant(){
        System.out.print("Cog ");
    }
    public void func(){
        Capgemini();
        Cognizant();
    }
    public ITCompanies(){
        func();
    }
}

public class Main
{
	public static void main(String[] args) {
	      ITCompanies javaObj = new ITCompanies();
	}
}

A. Cap Cog

B. Cap Cap

C. Cog Cog

D. Cap Cog Cap Cog

Question: 131

Can we call Constructor without creating an object ?

A. Yes

B. No

Question: 132

package com.google.test;

public class Abc {

	private int a = 10;
	int b = 20;
	protected int c = 30;
	public int d = 40;

	public void Abc() {
		System.out.print(a);
		System.out.print(b);
		System.out.print(c);
		System.out.print(d);
	}

	public void xyz() {
		System.out.println("Hello");
	}

	public static void main(String[] args) {
		Abc obj = new Abc();
		obj.xyz();
	}
}

A. 10203040

B. 10203040Hello

C. Hello

D. None of these

Question: 133

package com.google.test;

public class Abc {

	private int a = 10;
	int b = 20;
	protected int c = 30;
	public int d = 40;

	public void Abc() {
		System.out.print(a);
		System.out.print(b);
		System.out.print(c);
		System.out.print(d);
	}

	public void xyz() {
		System.out.println("Hello");
	}

	public static void main(String[] args) {
		Abc obj = new Abc();
	}
}

A. 10203040

B. 10203040Hello

C. Hello

D. Nothing is printed

Question: 134

public class Main
{
	public static void main(String[] args) {
		String str = new String();
		System.out.println(str);
	}
}

A. null

B. Nothing is printed

C. Exception

D. Compilation Error

Question: 135

What is the output of below program if nothing is passed as argument to main()?

public class Main
{
	public static void main(String[] args) {
		System.out.println(args[1]);
	}
}

A. null

B. Nothing is printed

C. Compilation Error

D. ArrayIndexOutOfBoundsException

Question: 136

package com.google.test;

public class Abc {


public static void main (String []args) {
	

String j = "Ash" ;

switch (j) {

case "Ash": 
	System.out.println("Ash");
	
case "xyz": 
	System.out.println("xyz");
	
case "abc": 
	System.out.println("abc");
	
case "lmn": 
	System.out.println("lmn");

}
	
}
}

A. Ash

B. Ashxyz

C. Nothing is printed

D. AshxyzabcImn

Question: 137

Find the output of Java program -

public class Main
{   
    public static int a(){
        
        return 65;
    }
    
    public int b(){
        
        return a();
    }
	public static void main(String[] args) {
		System.out.print("AT&T Lab");
	}
}

A. AT&T Lab65

B. AT&T Lab 65

C. AT&T Lab

D. Compilation Error

Question: 138

Find the output of below Java program-

public class Main
{   
    public static int a(){
        
        return 65;
    }
    
    public static int b(){
        
        return a();
    }
	public static void main(String[] args) {
		System.out.print(""+b());
	}
}

A. 6565

B. 65

C. "65"

D. None of the above

Question: 139

Find the output of below Java program -

public class Main
{   
    static int i = 0;
    
    public static int a(){
        String [] arr = null;
        main(arr);
        return 65;
    }
    
    public static int b(){
        
        return a();
    }
	public static void main(String[] args) {
	    
	    if(i>0) return;
	    i++;    
		System.out.print(""+b());
		
	
	}
}

A. 65 & Infinite loop

B. 65

C. Nothing is printed

D. Compilation Error

Question: 140

public class Main
{
	public static void main(String[] args) {
		int a = 'a';
		System.out.print(a);
	}
}

A. 'a'

B. a

C. 65

D. 97

Question: 141

Find the output of below program

public class Main
{
	public static void main(String[] args) {
		int a = Integer.parseInt("cppbuzz");
		System.out.print(a);
	}
}

A. 99

B. 67

C. Unpredictable Value

D. NumberFormatException

Question: 142

In case of 'try' & 'catch' block, is it possible to use only 'try' block instead of using 'catch'?

A. Yes

B. No

Question: 143

Find the output of below program

public class Main
{
public static void main(String[] args) {
    try{
	int a = -100;
	System.out.print(a);
    }
}
}

A. -100

B. Compilation Error

C. Exception since catch is missing

D. Exception since finally is missing

Question: 144

Can we use 'catch()' without passing arguments in it?

A. Yes

B. No It is compilation error

Question: 145

public class Main
{
public static void main(String[] args) {
    
try{
    int a = -100;
    System.out.print(a);
    throw null;
}
catch(Exception obj){
    System.out.print(obj.getMessage());
}
}
}

A. -100

B. null

C. -100null

D. null-100

Question: 146

public class Main
{
public static void main(String[] args) {
    
try{
    int a = -100;
    throw null;
    System.out.print(a);
}
catch(Exception obj){
    System.out.print(obj.getMessage());
}
}
}

A. -100null

B. -100

C. null

D. Compilation Error - unreachable statement at line 8

Question: 147

public class Main
{
System.out.print("Hello");
    
public static void main(String[] args) {
         
     }
}

A. Hello

B. Compilation Error

C. Exception

D. None of these

Question: 148

public class Main
{

public static void main(String[] args) {
     
    System.out.print(2>4?"Hi":"Hello");
    
     }

A. Compilation Error

B. Exception

C. Hi

D. Hello

Question: 149

Find the output of below program 

public class Main
{
	public static void main(String[] args) {
		int [] array = {1,2,3,4,5};
		
		for(int i = -1; i<5;i++)
		    System.out.print(array[i]);
		
	}
}

A. 12345

B. 1234

C. Compilation Error

D. ArrayIndexOutOfBoundsException

Question: 150

public class Main
{
    public static void function(int temp){
        temp*=2;
    }
    public static void main(String[] args) {
        int a = 10;
	function(a);
	System.out.print(a);
    }
	
}

A. 20

B. 10

C. Compilation Error

D. None of the above

Question: 151

public class Main
{
public static void function(int [] arr){
    
    for(int i = 0; i<5;i++)
	    arr[i] = arr[i] *2;
}

public static void main(String[] args) {
	int [] array = {1,2,3,4,5};
	
	function(array);
	
	for(int i = 0; i<5;i++)
	    System.out.print(array[i]);
	
}
}

A. Compilation Error

B. 12345

C. 246810

D. Exception

Question: 152

In Java how arrays are passed in methods?

A. Arrays are passed by Value

B. Arrays are passed by Reference

C. It depends on type of array

D. It depends on Compiler

Question: 153

Can Abstract classes instantiated?

A. Yes

B. No

Question: 154

What is 'abstract' in Java?

A. It is an Keyword

B. Its is a Data type

C. It is a Class

D. None of the above

Question: 155

Can we override final methods of abstract classes?

A. Yes

B. No

Question: 156

Abstract methods of abstract classes are mandatory to be overridden by sub classes. Is that true?

A. Yes

B. No

Question: 157

What is the output of below code?

public class Testing {

public static void main (String []args) {

String readAllFile = new Scanner(new File("cppbuzz.txt")).useDelimiter("A").next();

System.out.println(readAllFile);

}
}

A. It reads first line of cppbuzz.txt file

B. It reads first character of cppbuzz.txt file

C. It reads all the contents of cppbuzz.txt file

D. None of these

Question: 158

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    System.out.println(mylist.size());
	}
}

A. Compilation Error

B. Exception

C. 1

D. 0

Question: 159

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.remove(0);
	    System.out.println(mylist.size());
	}
}

A. Nothing is printed

B. IndexOutOfBoundsException

C. Compilation Error

D. 0

Question: 160

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(5);
	    System.out.println(mylist.remove(0));
	}
}

A. Nothing is printed

B. Compilation Error

C. Exception

D. 5

Question: 161

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    System.out.println(mylist.add(5));
	}
}

A. Nothing is printed

B. 5

C. 0

D. true

Question: 162

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    int a = mylist.get(-1);
	    System.out.println(a);
	}
}

A. -1

B. 0

C. IndexOutOfBoundsException

D. None of the above

Question: 163

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    System.out.println(mylist.get((mylist.remove(2))));
	}
}

A. true

B. -2

C. Compilation Error

D. 0

Question: 164

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    
	    System.out.print(mylist.size());
	    for(int i = 0; i<mylist.size(); i++){
	        mylist.remove(i);
	        System.out.print(mylist.size());
	    }
	    
	}
}

A. 331

B. 3321

C. 310

D. 321

Question: 165

List is part of Java Collections API

A. True

B. False

Question: 166

Find the output of below program

import java.util.*;

public class Main
{
public static void main(String[] args) {
    List<Integer> list = new ArrayList();
    list.add(10);
    System.out.print(list.size());
    List<Integer> list2 = new ArrayList(list);
    System.out.print(list2.size());

    }
}

A. 22

B. 12

C. 11

D. 21

Question: 167

Java List has an instance variable to handle the size.
It is incremented when you add, and decremented when you remove. Calling list.size() returns a variable, and is therefore O(1)

A. True

B. False

Question: 168

What is Big-O complexity notation to search an element in List

A. O(1)

B. O(n)

C. O(log(n))

D. None of these

Question: 169

What is Big-O complexity notation to insert an element in List

A. O(n)

B. O(1)

C. O(log(n))

D. None of these

Question: 170

How many instances Singleton class can have in Java?

A. 1

B. Depends on the calling program

C. Depends on class creating object of Singleton class

D. 256

Question: 171

Packages can contain hidden classes that are used by the package itself but are not visible or accessible outside the package.

A. True

B. False

Question: 172

Different packages can have classes with the same name

A. True

B. False

Question: 173

Packages resolves ambiguity for classes which have the same name

A. True

B. False

Question: 174

Does Java allows default values to arguments?

public void sum(int a = 10, int b = 20) ?

A. Yes

B. No

Question: 175

import java.util.*;

public class Main
{
    public static float sum1(float a, float b){
        System.out.print("cppbuzz");
        return a+b;
    }
    
    public static float sum(int a, int b){
        System.out.print("hello");
        return a+b;
    }
    
   public static void main(String[] args) {
        System.out.println(sum(-5, -6));
   }
}

A. cppbuzz-11

B. cppbuzz-11.0

C. hello-11

D. hello-11.0

Question: 176

Which collection framework allows null values and is unsynchronized?

A. HashTable

B. EnumSet

C. Vector

D. ArrayList

Question: 177

Converting an object of type (Integer) to its corresponding primitive (int) value is known as

A. Autoboxing

B. Morphing

C. Unboxing

D. Typecasting

Question: 178

Find the output of below program

class A {
  void f1 () {
    System.out.print("class-A ");
  }
}
class B extends A {
  void f1 () {
    System.out.print("Class-B ");
  }
} 
 
class Main {
  public static void main (String s[]) {
    A refA = new A();
    A refB = new B();
 
    refA.f1();
    refB.f1();
  }
}

A. class-A class-A

B. class-B class-B

C. class-B class-A

D. class-A class-B

Question: 179

Which of the following is a correct implementation of method overloading?

A. void methodA(){} int methodA(){}

B. void methodA(){} void methodA(int a){}

C. void methodA(){} int methodB(int a){}

D. int methodA(){} int methodAA(i{}

Question: 180

static import provides accessibility to static members of the class only. State true or false

A. True

B. False

Question: 181

Enum is most useful in creating

A. Singletons

B. Java Beans

C. Transactions

D. None of the above

Question: 182

Which is the base class of all the exceptions & errors in Java?

A. Exception

B. Throwable

C. JavaBase

D. Error

Question: 183

which class or interface defines wait(), notify() and notifyall() methods

A. Thread

B. Object

C. Runnable

D. Class

Question: 184

Which of the following exception is Checked exception?

A. NullPointerException

B. NumberFormatException

C. ClassCastException

D. ParseException

Question: 185

Which exception is thrown by following code?

public class Main
{
public static void main(String[] args) {
	int a = Integer.parseInt("123A");
	System.out.println(a);
}
}

A. NumberFormatException

B. IllegalArgumentException

C. RuntimeException

D. ParseException

Question: 186

List of top 10 Exceptions used in Java

1. NullPointerException // Unchecked
2. NumberFormatException // Unchecked
3. IllegalArgumentException // Unchecked
4. RuntimeException // Unchecked
5. IllegalStateException // Unchecked
6. NoSuchMethoException // Checked
7. ClassCastException // Unchecked
8. Exception // Checked
9. ParseException // Checked
10. InvocationTargetException // Checked

A.

B.

C.

D.

Question: 187

Can we define main() method inside abstract class?

A. Yes

B. No

Question: 188

What is output of below code?

abstract public class Main
{
    public static void main(String[] args) {
        System.out.println("Hello CppBuzz");
    }
}

A. Compilation Error

B. Hello CppBuzz

C. 13

D. Hello CppBuzz13

Question: 189

Is it allowed to run below code when sum() is not defined and Main class is not inherited? What is the output of below code?

abstract public class Main
{
    abstract public void sum(int a, int b);
    
    public static void main(String[] args) {
	System.out.println("CppBuzz");
    }
}

A. It is not allowed. Compilation Error

B. It is allowed. CppBuzz

C. It is allowed. Compilation Error

D. None of the above

Question: 190

What is abstract in Java?

A. abstract is a keyword

B. abstract is a method

C. abstract is a class

D. All of these

Question: 191

Where is Reference variables allocated?

A. Heap

B. Stack

C. Cache

D. Register

Question: 192

What is use of join() in threads of Java?

A. The main thread waits for other threads to finish

B. The main thread is finished first then other threads

C. Other threads will sleep until main is complete

D. All of these

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