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Java Interview Questions on Networking - 0 Questions

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

Expert datatype[Posted by: Admin | Chicago, USA]

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

Practitioner operators[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner operators[Posted by: Admin | Chicago, USA]

Question: 11

Which of the following operators has more precedance in Java?

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

Beginner operators[Posted by: Admin | Chicago, USA]

Question: 12

Which of the following is not an operator in Java?

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Expert operators[Posted by: Admin | Chicago, USA]

Question: 14

Which of the following operator has more precedence?

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

Beginner operators[Posted by: Admin | Chicago, USA]

Question: 15

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

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

Beginner operators[Posted by: Admin | Chicago, USA]

Question: 16

Which one of the following is Equality operator in Java?

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

Beginner operators[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

Question: 18

On which platforms Java runs?

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

Beginner other[Posted by: Admin | Chicago, USA]

Question: 19

Java is case sensitive langauge

(A) True
(B) False

Beginner variables[Posted by: Admin | Chicago, USA]

Question: 20

Java program processing always starts with main() method

(A) True
(B) False

Beginner methods[Posted by: Admin | Chicago, USA]

Question: 21

Which of these are Access Modifiers in java?

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

Practitioner other[Posted by: Admin | Chicago, USA]

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

Beginner methods[Posted by: Admin | Chicago, USA]

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

Beginner datatype[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Beginner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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"

Expert other[Posted by: Admin | Chicago, USA]

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

Practitioner variables[Posted by: Admin | Chicago, USA]

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

Practitioner variables[Posted by: Admin | Chicago, USA]

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

Practitioner variables[Posted by: Admin | Chicago, USA]

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

Expert variables[Posted by: Admin | Chicago, USA]

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

Expert variables[Posted by: Admin | Chicago, USA]

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

Beginner other[Posted by: Admin | Chicago, USA]

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

Beginner other[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: ASISH ARAVIND | Des Moines USA]

Question: 50

Arrays is a group of similar type of datatype

(A) True
(B) False

Beginner other[Posted by: Admin | Chicago, USA]

Question: 51

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

(A) True
(B) False

Beginner other[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

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

Expert arrays[Posted by: Admin | Chicago, USA]

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

Expert arrays[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practitioner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner variables[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner loops[Posted by: Admin | Chicago, USA]

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

Beginner methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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

Beginner methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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

Beginner methods[Posted by: Admin | Chicago, USA]

Question: 79

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

(A) Yes
(B) No

Beginner methods[Posted by: Admin | Chicago, USA]

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

Beginner typecasting[Posted by: Admin | Chicago, USA]

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

Beginner typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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

Beginner typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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)

Practitioner typecasting[Posted by: Admin | Chicago, USA]

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

Beginner typecasting[Posted by: Admin | Chicago, USA]

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

Practitioner typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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

Practitioner typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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

Expert typecasting[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Beginner conditional[Posted by: Admin | Chicago, USA]

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

Practitioner conditional[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practitioner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Expert classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practitioner loops[Posted by: Admin | Chicago, USA]

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

Practitioner arrays[Posted by: Asish | Des Moines USA]

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) --

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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) - -

Expert methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Beginner inheritance[Posted by: Admin | Chicago, USA]

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

Beginner inheritance[Posted by: Admin | Chicago, USA]

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

Beginner inheritance[Posted by: Admin | Chicago, USA]

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

Practitioner inheritance[Posted by: Admin | Chicago, USA]

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

Practitioner other[Posted by: Admin | Chicago, USA]

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

Beginner modifiers[Posted by: Admin | Chicago, USA]

Question: 124

How many levels of visibility Java has?

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

Beginner inheritance[Posted by: Admin | Chicago, USA]

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

Practitioner modifiers[Posted by: Admin | Chicago, USA]

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

Beginner modifiers[Posted by: Admin | Chicago, USA]

Question: 127

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

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

Beginner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Beginner datatype[Posted by: Admin | Chicago, USA]

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

Expert classesAndobjects[Posted by: Admin | Chicago, USA]

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

Expert classesAndobjects[Posted by: Admin | Chicago, USA]

Question: 131

Can we call Constructor without creating an object ?

(A) Yes
(B) No

Practitioner classesAndobjects[Posted by: ASISH ARAVIND | Des Moines USA]

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

Expert classesAndobjects[Posted by: ASISH ARAVIND | Des Moines USA]

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

Expert classesAndobjects[Posted by: ASISH ARAVIND | Des Moines USA]

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

Expert classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert conditional[Posted by: ASISH ARAVIND | Des Moines USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert methods[Posted by: Admin | Chicago, USA]

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

Practitioner datatype[Posted by: Admin | Chicago, USA]

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

Practitioner typecasting[Posted by: Admin | Chicago, USA]

Question: 142

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

(A) Yes
(B) No

Beginner exceptions[Posted by: Admin | Chicago, USA]

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

Beginner exceptions[Posted by: Admin | Chicago, USA]

Question: 144

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

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

Beginner exceptions[Posted by: Admin | Chicago, USA]

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

Practitioner exceptions[Posted by: Admin | Chicago, USA]

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

Practitioner exceptions[Posted by: Admin | Chicago, USA]

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

Practitioner classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Expert arrays[Posted by: Admin | Chicago, USA]

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

Practitioner methods[Posted by: Admin | Chicago, USA]

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

Practitioner arrays[Posted by: Admin | Chicago, USA]

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

Beginner arrays[Posted by: Admin | Chicago, USA]

Question: 153

Can Abstract classes instantiated?

(A) Yes
(B) No

Beginner abstractclass[Posted by: Admin | Chicago, USA]

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

Beginner abstractclass[Posted by: Admin | Chicago, USA]

Question: 155

Can we override final methods of abstract classes?

(A) Yes
(B) No

Expert abstractclass[Posted by: Admin | Chicago, USA]

Question: 156

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

(A) Yes
(B) No

Practitioner abstractclass[Posted by: Admin | Chicago, USA]

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

Practitioner filehandling[Posted by: ASISH ARAVIND | Des Moines USA]

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

Beginner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

Question: 165

List is part of Java Collections API

(A) True
(B) False

Beginner collection[Posted by: Admin | Chicago, USA]

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

Beginner collection[Posted by: Admin | Chicago, USA]

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

Practitioner collection[Posted by: Admin | Chicago, USA]

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

Expert collection[Posted by: Admin | Chicago, USA]

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

Expert collection[Posted by: Admin | Chicago, USA]

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

Practitioner singleton[Posted by: Admin | Chicago, USA]

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

Beginner packages[Posted by: Admin | Chicago, USA]

Question: 172

Different packages can have classes with the same name

(A) True
(B) False

Beginner packages[Posted by: Admin | Chicago, USA]

Question: 173

Packages resolves ambiguity for classes which have the same name

(A) True
(B) False

Beginner packages[Posted by: Admin | Chicago, USA]

Question: 174

Does Java allows default values to arguments?

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

(A) Yes
(B) No

Beginner overriding[Posted by: Admin | Chicago, USA]

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

Practitioner overriding[Posted by: Admin | Chicago, USA]

Question: 176

Which collection framework allows null values and is unsynchronized?

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

Expert collection[Posted by: Admin | Chicago, USA]

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

Expert other[Posted by: Admin | Chicago, USA]

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

Practitioner polymorphism[Posted by: Admin | Chicago, USA]

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{}

Practitioner polymorphism[Posted by: Admin | Chicago, USA]

Question: 180

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

(A) True
(B) False

Practitioner packages[Posted by: Admin | Chicago, USA]

Question: 181

Enum is most useful in creating

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

Expert classesAndobjects[Posted by: Admin | Chicago, USA]

Question: 182

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

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

Expert exceptions[Posted by: Admin | Chicago, USA]

Question: 183

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

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

Practitioner interfaces[Posted by: Admin | Chicago, USA]

Question: 184

Which of the following exception is Checked exception?

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

Beginner exceptions[Posted by: Admin | Chicago, USA]

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

Expert exceptions[Posted by: Admin | Chicago, USA]

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)

Beginner exceptions[Posted by: Admin | Chicago, USA]

Question: 187

Can we define main() method inside abstract class?

(A) Yes
(B) No

Practitioner interfaces[Posted by: Admin | Chicago, USA]

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

Practitioner interfaces[Posted by: Admin | Chicago, USA]

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

Practitioner interfaces[Posted by: Admin | Chicago, USA]

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

Beginner interfaces[Posted by: Admin | Chicago, USA]

Question: 191

Where is Reference variables allocated?

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

Beginner referencevar[Posted by: Admin | Chicago, USA]

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

Practitioner other[Posted by: Admin | Chicago, USA]

Question: 193

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

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

Beginner exceptions[Posted by: Arvind | Navi Mumbai India]

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

Beginner exceptions[Posted by: Arvind | Navi Mumbai India]

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

Beginner exceptions[Posted by: Arvind | Navi Mumbai India]

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

Expert classesAndobjects[Posted by: Arvind | Navi Mumbai India]

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

Beginner other[Posted by: Arvind | Navi Mumbai India]

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

Beginner other[Posted by: Arvind | Navi Mumbai India]

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

Practionar variables[Posted by: Admin | Chicago, USA]

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

Beginner datatype[Posted by: Admin | Chicago, USA]

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

Practionar classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practionar classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practionar methods[Posted by: Admin | Chicago, USA]

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

Beginner datatype[Posted by: Admin | Chicago, USA]

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

Practionar arrays[Posted by: Admin | Chicago, USA]

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

Practionar arrays[Posted by: Admin | Chicago, USA]

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

Practionar conditional[Posted by: Admin | Chicago, USA]

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

Practionar inheritance[Posted by: Admin | Chicago, USA]

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

Beginner datatype[Posted by: Admin | Chicago, USA]

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

Practionar inheritance[Posted by: Admin | Chicago, USA]

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

Expert exceptions[Posted by: Admin | Chicago, USA]

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

Practionar classesAndobjects[Posted by: Admin | Chicago, USA]

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

Practionar inheritance[Posted by: Admin | Chicago, USA]

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

Practionar inheritance[Posted by: Admin | Chicago, USA]

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

Practionar interfaces[Posted by: Admin | Chicago, USA]

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

Practionar operators[Posted by: Admin | Chicago, USA]

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

Practionar operators[Posted by: Admin | Chicago, USA]

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?SomeGarbageCharacter
(D) Compilation/RuntimeError

Expert arrays[Posted by: Admin | Chicago, USA]

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Subjective Questions

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