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

Level: Expert Category of MCQ: datatype

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

Level: Practitioner Category of MCQ: operators

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

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: operators

Question: 11

Which of the following operators has more precedance in Java?

(A) -
(B) +
(C) *

Level: Beginner Category of MCQ: operators

Question: 12

Which of the following is not an operator in Java?

(A) |
(B) ^
(C) ~
(D) <->

Level: Beginner Category of MCQ: operators

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

Level: Expert Category of MCQ: operators

Question: 14

Which of the following operator has more precedence?

(A) ()
(B) ++
(C) *
(D) >=

Level: Beginner Category of MCQ: operators

Question: 15

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

(A) ()
(B) *
(C) +
(D) ++

Level: Beginner Category of MCQ: operators

Question: 16

Which one of the following is Equality operator in Java?

(A) >=
(B) <=
(C) !=
(D) +=

Level: Beginner Category of MCQ: operators

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

Level: Beginner Category of MCQ: variables

Question: 18

On which platforms Java runs?

(A) Windows
(B) Mac OS
(C) UNIX
(D) All of these

Level: Beginner Category of MCQ: other

Question: 19

Java is case sensitive langauge

(A) True
(B) False

Level: Beginner Category of MCQ: variables

Question: 20

Java program processing always starts with main() method

(A) True
(B) False

Level: Beginner Category of MCQ: methods

Question: 21

Which of these are Access Modifiers in java?

(A) default
(B) public
(C) protected
(D) All of these

Level: Practitioner Category of MCQ: other

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

Level: Beginner Category of MCQ: methods

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

Level: Beginner Category of MCQ: datatype

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: loops

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

Level: Beginner Category of MCQ: switch

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

Level: Practitioner Category of MCQ: switch

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

Level: Expert Category of MCQ: switch

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

Level: Expert Category of MCQ: switch

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

Level: Practitioner Category of MCQ: switch

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

Level: Expert Category of MCQ: switch

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

Level: Expert Category of MCQ: switch

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

Level: Expert Category of MCQ: switch

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

Level: Practitioner Category of MCQ: if-else

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) Compilation Error

Level: Expert Category of MCQ: other

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

Level: Practitioner Category of MCQ: variables

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

Level: Practitioner Category of MCQ: variables

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

Level: Practitioner Category of MCQ: variables

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

Level: Expert Category of MCQ: variables

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

Level: Expert Category of MCQ: variables

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

Level: Beginner Category of MCQ: other

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

Level: Beginner Category of MCQ: other

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

Level: Beginner Category of MCQ: loops

Question: 50

Arrays is a group of similar type of datatype

(A) True
(B) False

Level: Beginner Category of MCQ: other

Question: 51

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

(A) True
(B) False

Level: Beginner Category of MCQ: other

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

Level: Beginner Category of MCQ: arrays

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

Level: Beginner Category of MCQ: arrays

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

Level: Beginner Category of MCQ: arrays

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

Level: Beginner Category of MCQ: arrays

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

Level: Expert Category of MCQ: arrays

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

Level: Expert Category of MCQ: arrays

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

Level: Beginner Category of MCQ: arrays

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Practitioner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: variables

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: loops

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

Level: Beginner Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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

Level: Beginner Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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

Level: Beginner Category of MCQ: methods

Question: 79

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

(A) Yes
(B) No

Level: Beginner Category of MCQ: methods

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

Level: Beginner Category of MCQ: typecasting

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

Level: Beginner Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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

Level: Beginner Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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)

Level: Practitioner Category of MCQ: typecasting

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

Level: Beginner Category of MCQ: typecasting

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

Level: Practitioner Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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

Level: Practitioner Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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

Level: Expert Category of MCQ: typecasting

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

Level: Practitioner Category of MCQ: if-else

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

Level: Practitioner Category of MCQ: if-else

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

Level: Practitioner Category of MCQ: if-else

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

Level: Practitioner Category of MCQ: if-else

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

Level: Practitioner Category of MCQ: if-else

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

Level: Beginner Category of MCQ: if-else

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

Level: Practitioner Category of MCQ: if-else

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Practitioner Category of MCQ: classesAndobjects

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

Level: Expert Category of MCQ: classesAndobjects

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) 1

Level: Practitioner Category of MCQ: loops

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

Level: Practitioner Category of MCQ: arrays

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) --

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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) - -

Level: Expert Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Beginner Category of MCQ: inheritance

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

Level: Beginner Category of MCQ: inheritance

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

Level: Beginner Category of MCQ: inheritance

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

Level: Practitioner Category of MCQ: inheritance

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

Level: Practitioner Category of MCQ: other

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

Level: Beginner Category of MCQ: modifiers

Question: 124

How many levels of visibility Java has?

(A) 1
(B) 2
(C) 3
(D) 4

Level: Beginner Category of MCQ: inheritance

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

Level: Practitioner Category of MCQ: modifiers

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

Level: Beginner Category of MCQ: modifiers

Question: 127

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

(A) 1
(B) 2
(C) 3
(D) Max 256

Level: Beginner Category of MCQ: classesAndobjects

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

Level: Beginner Category of MCQ: datatype

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

Level: Expert Category of MCQ: classesAndobjects

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

Level: Expert Category of MCQ: classesAndobjects

Question: 131

Can we call Constructor without creating an object ?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: classesAndobjects

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

Level: Expert Category of MCQ: classesAndobjects

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

Level: Expert Category of MCQ: classesAndobjects

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

Level: Expert Category of MCQ: classesAndobjects

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

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: switch

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

Level: Practitioner Category of MCQ: methods

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

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: methods

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

Level: Practitioner Category of MCQ: datatype

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

Level: Practitioner Category of MCQ: typecasting

Question: 142

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

(A) Yes
(B) No

Level: Beginner Category of MCQ: exceptions

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

Level: Beginner Category of MCQ: exceptions

Question: 144

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

(A) Yes
(B) No It is compilation error

Level: Beginner Category of MCQ: exceptions

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

Level: Practitioner Category of MCQ: exceptions

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

Level: Practitioner Category of MCQ: exceptions

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

Level: Practitioner Category of MCQ: classesAndobjects

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

Level: Practitioner Category of MCQ: methods

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

Level: Expert Category of MCQ: arrays

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

Level: Practitioner Category of MCQ: methods

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

Level: Practitioner Category of MCQ: arrays

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

Level: Beginner Category of MCQ: arrays

Question: 153

Can Abstract classes instantiated?

(A) Yes
(B) No

Level: Beginner Category of MCQ: abstractclass

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

Level: Beginner Category of MCQ: abstractclass

Question: 155

Can we override final methods of abstract classes?

(A) Yes
(B) No

Level: Expert Category of MCQ: abstractclass

Question: 156

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

(A) Yes
(B) No

Level: Practitioner Category of MCQ: abstractclass

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

Level: Practitioner Category of MCQ: filehandling

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

Level: Beginner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

Question: 165

List is part of Java Collections API

(A) True
(B) False

Level: Beginner Category of MCQ: collection

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

Level: Beginner Category of MCQ: collection

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

Level: Practitioner Category of MCQ: collection

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

Level: Expert Category of MCQ: collection

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

Level: Expert Category of MCQ: collection

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

Level: Practitioner Category of MCQ: singleton

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

Level: Beginner Category of MCQ: packages

Question: 172

Different packages can have classes with the same name

(A) True
(B) False

Level: Beginner Category of MCQ: packages

Question: 173

Packages resolves ambiguity for classes which have the same name

(A) True
(B) False

Level: Beginner Category of MCQ: packages

Question: 174

Does Java allows default values to arguments?

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

(A) Yes
(B) No

Level: Beginner Category of MCQ: overriding

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

Level: Practitioner Category of MCQ: overriding

Question: 176

Which collection framework allows null values and is unsynchronized?

(A) HashTable
(B) EnumSet
(C) Vector
(D) ArrayList

Level: Expert Category of MCQ: collection

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

Level: Expert Category of MCQ: other

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

Level: Practitioner Category of MCQ: polymorphism

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{}

Level: Practitioner Category of MCQ: polymorphism

Question: 180

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

(A) True
(B) False

Level: Practitioner Category of MCQ: packages

Question: 181

Enum is most useful in creating

(A) Singletons
(B) Java Beans
(C) Transactions
(D) None of the above

Level: Expert Category of MCQ: classesAndobjects

Question: 182

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

(A) Exception
(B) Throwable
(C) JavaBase
(D) Error

Level: Expert Category of MCQ: exceptions

Question: 183

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

(A) Thread
(B) Object
(C) Runnable
(D) Class

Level: Practitioner Category of MCQ: interfaces

Question: 184

Which of the following exception is Checked exception?

(A) NullPointerException
(B) NumberFormatException
(C) ClassCastException
(D) ParseException

Level: Beginner Category of MCQ: exceptions

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

Level: Expert Category of MCQ: exceptions

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)

Level: Beginner Category of MCQ: exceptions

Question: 187

Can we define main() method inside abstract class?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: interfaces

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

Level: Practitioner Category of MCQ: interfaces

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

Level: Practitioner Category of MCQ: interfaces

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

Level: Beginner Category of MCQ: interfaces

Question: 191

Where is Reference variables allocated?

(A) Heap
(B) Stack
(C) Cache
(D) Register

Level: Beginner Category of MCQ: referencevar

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

Level: Practitioner Category of MCQ: other

Question: 193

Which of these clause will be executed even if no exceptions are found?

(A) throws
(B) finally
(C) catch
(D) throw

Level: Beginner Category of MCQ: exceptions

Question: 194

 A single try block must be followed by which of these?

(A) finally
(B) catch
(C) finally & catch
(D) none of the mentioned

Level: Beginner Category of MCQ: exceptions

Question: 195

 Which of these packages contain all the Java’s built in exceptions?

(A) java.io
(B) java.util
(C) java.lang
(D) java.net

Level: Beginner Category of MCQ: exceptions

Question: 196

Which of the following reference types cannot be generic?

(A) Anonymous inner class
(B) Interface
(C) Inner class
(D) All of the mentioned

Level: Expert Category of MCQ: classesAndobjects

Question: 197

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

(A) 0
(B) garbage value
(C) runtime error
(D) compile time error

Level: Beginner Category of MCQ: other

Question: 198

Which of the following statements is/are TRUE regarding JAVA ? (a) Constants that cannot be changed are declared using the ‘static’ keyword. (b) A class can only inherit one class but can implement multiple interfaces.

(A) a
(B) b
(C) a and both
(D) Neither a nor b

Level: Beginner Category of MCQ: other

Question: 199

Find the output of below program:

public class Main
{
    public static int a;

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

(A) 10
(B) Compilation Error
(C) Undefind
(D) 0

Level: Practitioner Category of MCQ: variables

Question: 200

Find the output of below Java program:

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

}

(A) 10
(B) 0
(C) Error in Code
(D) Nothing is printed

Level: Beginner Category of MCQ: datatype

Question: 201

Find the output of below Java program:

public class Main
{
    public int a;
    
    public Main(int a){
        a = a;
        System.out.print(a);
    }
	public static void main(String[] args) {
		Main obj = new Main(5);
		System.out.print(obj.a);
	}
}

(A) 00
(B) 05
(C) 50
(D) 55

Level: Practitioner Category of MCQ: classesAndobjects

Question: 202

public class Main {
 int num = 100;
 
 public void calc(int num) {
 this.num = num * 10;
 }
 
 public void printNum(){
 System.out.println(num);
 }
 
 public static void main(String[] args) {
 Main obj = new Main ();
 obj.calc(2);
 obj.printNum();
 }
}

(A) 100
(B) 1000
(C) 2
(D) 20

Level: Practitioner Category of MCQ: classesAndobjects

Question: 203

public class Main {
 String name;
 
 Main(String n) {
 name = n;
 }
 
 public static void main(String[] args) {
 Main ref1 = new Main("laptop");
 Main ref2 = new Main("tv");
 System.out.println(ref2.equals(ref1));
 }
 
 public boolean equals(Object o) {
 Main m = (Main) o;
 if (m.name != null) {
 return true;
 }
 return false;
 }
 
}

(A) true
(B) false
(C) Compilation Error
(D) None of the above

Level: Practitioner Category of MCQ: methods

Question: 204

import java.util.*;

public class Main {
 public static void main(String[] args) {
 List p = new ArrayList();
 p.add(7);
 p.add(1);
 p.add(5);
 p.add(1);
 p.remove(1);
 System.out.println(p);
 }
}

(A) [7,1,5]
(B) [7,5,1]
(C) [7, 1, 5, 1]
(D) None of the above

Level: Beginner Category of MCQ: datatype

Question: 205

public class Main{
    
 public static void main(String[] args) {
     
 String[] stringArr = {"cpp ", "buzz "};
 
 for (int x = 0; x < 3; x++) {
     for (String s : stringArr) {
     System.out.print(x + " " + s);
     if (x == 1) {
     break;
     }
   }
  }
 }
}

(A) 0 cpp 0 buzz 1 cpp 1 buzz
(B) 0 cpp 0 buzz 1 cpp 2 buzz
(C) 0 cpp 0 buzz 1 cpp 1 buzz 2 cpp 2 buzz
(D) 0 cpp 0 buzz 1 cpp 2 cpp 2 buzz

Level: Practitioner Category of MCQ: arrays

Question: 206

import java.util.ArrayList;
import java.util.List;

public class Main {
 public static void main(String[] args) {
 List<Integer> elements = new ArrayList<>();
 elements.add(10);
 int firstElmnt = elements.get(1);
 System.out.println(firstElmnt);
 }
}

(A) 0
(B) 10
(C) null
(D) IndexOutOfBoundsException

Level: Practitioner Category of MCQ: arrays

Question: 207

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

int cardVal = 12;

switch (cardVal) {
 case 4: case 5: case 6:
 case 7: case 8:
 System.out.println("India");
 break;
 case 9: case 10: case 11:
 System.out.println("USA");
 break;
 case 15: case 16:
 System.out.println("Canada");
 break;
 default:
 System.out.println("Germany");
}

}
}

(A) Germany
(B) India
(C) Canada
(D) USA

Level: Practitioner Category of MCQ: switch

Question: 208

abstract class Writer {
 public static void write() {
 System.out.println("Reading...");
 }
}
class Author extends Writer {
 public static void write() {
 System.out.println("Reading book");
 }
}
public class Programmer extends Writer {
 public static void write() {
 System.out.println("Reading code");
 }
 public static void main(String[] args) {
 Writer w = new Programmer();
 w.write();
 }
}

(A) Reading...
(B) Reading Book
(C) Reading Code
(D) Compilation Error

Level: Practitioner Category of MCQ: inheritance

Question: 209

import java.util.*;
public class Main {
 public static void main(String[] args) {
 List<String> items = new ArrayList<>();
 items.add("Pen");
 items.add("Pencil");
 items.add("Box");
 for (String i : items) {
 if (i.indexOf("P") == 0) {
 continue;
 } else {
 System.out.print(i+" ");
 }
 }
 }
}

(A) Pen Pencil Box
(B) Pen Pencil
(C) Box
(D) Compilation Error

Level: Beginner Category of MCQ: datatype

Question: 210

Which access modifier makes a member available only to classes within the same package or subclasses?

(A) Private
(B) Protected
(C) Public
(D) Package-Private

Level: Practitioner Category of MCQ: inheritance

Question: 211

public class Main {
 public static void main(String[] args) {
 int x = 10;
 int y = 2;
 try {
 for (int z = 2; z >= 0; z--) {
 int ans = x / z;
System.out.print(ans+ " ");
 }
 } catch (Exception e1) {
 System.out.println("CppBuzz1");
 } catch (ArithmeticException e1) {
 System.out.println("CppBuzz2");
 }
 }
}

(A) 5 10
(B) 5 10 CppBuzz1
(C) 5 10 CppBuzz2
(D) Compilation Error

Level: Expert Category of MCQ: exceptions

Question: 212

public class Calculator {
 int num = 100;
 public void calc(int num) {
 this.num = num * 10;
 }
 public void printNum(){
 System.out.println(num);
 }
 public static void main(String[] args) {
 Calculator obj = new Calculator ();
 obj.calc(2);
 obj.printNum();
 }
}

(A) 100
(B) 1000
(C) 2
(D) 20

Level: Practitioner Category of MCQ: classesAndobjects

Question: 213

class Feline {
 public String type = "f ";
 public Feline() {
 System.out.print("feline ");
 }
}
public class Cougar extends Feline {
 public Cougar() {
 System.out.print("cougar ");
 }
 void go() {
 type = "c ";
 System.out.print(this.type + super.type);
 }
 public static void main(String[] args) {
 new Cougar().go();
 }
}

(A) cougar c f
(B) feline cougar c c
(C) feline cougar c f
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

Question: 214

class Alpha {
 String getType() {
 return "alpha";
 }
}
class Beta extends Alpha {
 String getType() {
 return "beta";
 }
}
public class Gamma extends Beta {
 String getType() {
 return "gamma";
 }
 public static void main(String[] args) {
 Gamma g1 = new Alpha();
 Gamma g2 = new Beta();
 System.out.println(g1.getType() + " "
 + g2.getType());
 }
}

(A) alpha beta
(B) beta beta
(C) gamma gamma
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

Question: 215

interface Rideable { String getGait(); }
public class Camel implements Rideable {
 int weight = 2;
 String getGait() { return " mph, lope"; }
 void go(int speed) {
 ++speed; weight++;
 int walkrate = speed * weight;
 System.out.print(walkrate + getGait());
 }
 public static void main(String[] args) {
 new Camel().go(8);
 }
}

(A) 16 mph, lope
(B) 24 mph, lope
(C) 27 mph, lope
(D) Compilation fails

Level: Practitioner Category of MCQ: interfaces

Question: 216

public class Main
{
	public static void main(String[] args) {
		int a = 10;
		
		if(++a==11 || ++a==12)
		++a;
		
		System.out.println(a);
	}
}

(A) 13
(B) 12
(C) 11
(D) 10

Level: Practitioner Category of MCQ: operators

Question: 217

public class Main
{
	public static void main(String[] args) {
		int a = 10;
		
		if(++a==11 && ++a==12)
		++a;
		
		System.out.println(a);
	}
}

(A) 10
(B) 11
(C) 12
(D) 13

Level: Practitioner Category of MCQ: operators

Question: 218

public class Main
{
public static void main(String[] args) {
    
String string = "Hello. How are you?";    
char str1[] = string.toCharArray();
char str2[] = new char[21];
int pos;

for(pos=0; pos<18; pos++);
{
  str2[pos] = str1[pos];
}

System.out.print(str1);
System.out.print(str2);
}
}

(A) Hello. How are you?Hello. How are you?
(B) Hello. How are you?
(C) Hello. How are you??
(D) Compilation/RuntimeError

Level: Expert Category of MCQ: arrays

Question: 219

Thread class defines several methods that help manage threads. Which of the following method suspends a thread for a period fo time?

(A) join
(B) sleep
(C) getPriority
(D) isAlive

Level: Beginner Category of MCQ: multithreading

Question: 220

Note:- Unlike many other computer languages, Java provides built-in support for multithreading. Multithreading in Java contains two or more parts that can run concurrently. A Java thread is actually a lightweight process.

(A)
(B)
(C)
(D)

Level: Beginner Category of MCQ: multithreading

Question: 221

Note:- A Java thread exists in several states - New, Running, Suspended, Blocked & Terminated.

(A)
(B)
(C)
(D)

Level: Beginner Category of MCQ: multithreading

Question: 222

Note: final static variables can't be modified once initialized and can be accessed outside of the class without creating object. Here is an example :-

public class JavaExample{
   public final static int DELAY = 5;
}

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

(A)
(B)

Level: Beginner Category of MCQ: variables

Question: 223

Note: You can create your own exceptions by extending RuntimeException class. Here is an example:-

public class MyException extends RuntimeException{
	
	public MyException(String message){
		super(message);
	}

}

//Example to use this exception 
throw new MyException("Any error message");

(A)
(B)

Level: Beginner Category of MCQ: exceptions

Question: 224

Note: Apache PDFBox is an open source pure-Java library that can be used to create, render, print, split, merge, alter, verify and extract text and meta-data of PDF files.

(A)
(B)
(D)

Level: Beginner Category of MCQ: other

Question: 225

What is the output of the program?
public class Main{
public static void main(String[] args){
int j;
System.out.println(j);
}
}

(A) 0
(B) Garbage Value
(C) Compiler Error
(D) Runtime Error

Level: Beginner Category of MCQ: datatype

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