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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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 11

Which of the following operators has more precedance in Java?

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

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

Question: 12

Which of the following is not an operator in Java?

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

Forum
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

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

Question: 14

Which of the following operator has more precedence?

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

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

Question: 15

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

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

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

Question: 16

Which one of the following is Equality operator in Java?

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

Forum
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

Forum
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

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

Question: 19

Java is case sensitive langauge

(A) True
(B) False

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

Question: 20

Java program processing always starts with main() method

(A) True
(B) False

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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"

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 50

Arrays is a group of similar type of datatype

(A) True
(B) False

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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)

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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) 1

Forum
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

Forum
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) --

Forum
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

Forum
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) - -

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 124

How many levels of visibility Java has?

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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 131

Can we call Constructor without creating an object ?

(A) Yes
(B) No

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 153

Can Abstract classes instantiated?

(A) Yes
(B) No

Forum
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

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

Question: 155

Can we override final methods of abstract classes?

(A) Yes
(B) No

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 165

List is part of Java Collections API

(A) True
(B) False

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

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

Question: 172

Different packages can have classes with the same name

(A) True
(B) False

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

Question: 173

Packages resolves ambiguity for classes which have the same name

(A) True
(B) False

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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{}

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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)

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

Question: 187

Can we define main() method inside abstract class?

(A) Yes
(B) No

Forum
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

Forum
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

Forum
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

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

Question: 191

Where is Reference variables allocated?

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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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

Forum
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??
(D) Compilation/RuntimeError

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

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

Forum
Beginner multithreading[Posted by: Admin | Chicago, USA]

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)

Forum
Beginner multithreading[Posted by: Admin | Chicago, USA]

Question: 221

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

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

Forum
Beginner multithreading[Posted by: Admin | Chicago, USA]

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)

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

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)

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

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)

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

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