Java Multiple Choice Questions for Experts

Question: 1

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

(A) 10
(B) 11
(C) 12
(D) Compilation Error

Level: Expert Category of MCQ: datatype

Question: 2

What do you mean by >>> operator in Java

(A) Left Shift Operator
(B) Right Shift Operator
(C) Zero Fill Right Shift
(D) Zero Fill Left Shift

Level: Expert Category of MCQ: operators

Question: 3

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

(A) 5
(B) 510
(C) 5100
(D) Compilation Error

Level: Expert Category of MCQ: switch

Question: 4

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

(A) 5
(B) 510
(C) 5100
(D) 100

Level: Expert Category of MCQ: switch

Question: 5

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

(A) 10
(B) 510
(C) 5100
(D) 100

Level: Expert Category of MCQ: switch

Question: 6

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

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

(A) Compilation Error
(B) 10-even-
(C) 10-even-0
(D) 10-odd

Level: Expert Category of MCQ: switch

Question: 7

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

(A) Compilation Error
(B) 10-even-
(C) 10-odd-
(D) 10-even-0

Level: Expert Category of MCQ: switch

Question: 8

public class CppBuzz {

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

(A) "cpp''buzz"
(B) "cpp''buzz"
(C) cpp''buzz
(D) Compilation Error

Level: Expert Category of MCQ: other

Question: 9

public class CppBuzz {

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

(A) 0
(B) 10"-10"
(C) 10-10
(D) Compilation Error

Level: Expert Category of MCQ: variables

Question: 10

public class CppBuzz {

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

(A) 30
(B) 1020
(C) 10+10+10
(D) 1010+10

Level: Expert Category of MCQ: variables

Question: 11

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

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

(A) a b c d e
(B) abcde
(C) 97 98 99 100 101
(D) 65 66 67 68 69

Level: Expert Category of MCQ: arrays

Question: 12

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

(A) a b c d e
(B) 96 97 98 99 101
(C) 65 66 67 68 69
(D) None of the above

Level: Expert Category of MCQ: arrays

Question: 13

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

(A) 63321
(B) 36
(C) 33
(D) 12336

Level: Expert Category of MCQ: methods

Question: 14

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

(A) 123456789
(B) 12345678
(C) 122
(D) None of the above

Level: Expert Category of MCQ: methods

Question: 15

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

(A) 1234.00
(B) 1234.34
(C) 1234
(D) Exception

Level: Expert Category of MCQ: typecasting

Question: 16

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

(A) 10.0
(B) 10
(C) error: loss precision
(D) Exception

Level: Expert Category of MCQ: typecasting

Question: 17

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

(A) 10.0000f
(B) 10.0000
(C) 10.00
(D) 10.0

Level: Expert Category of MCQ: typecasting

Question: 18

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

(A) 10
(B) 10.00
(C) 10.87
(D) NumberFormatException

Level: Expert Category of MCQ: typecasting

Question: 19

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

(A) 10.87
(B) 10.00
(C) 10
(D) error:possible loss of precision

Level: Expert Category of MCQ: typecasting

Question: 20

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

(A) 10.87
(B) 10.870000
(C) 10.8700
(D) 10.00

Level: Expert Category of MCQ: typecasting

Question: 21

How does below code behaves?

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

(A) Code runs but nothing is printed
(B) Code runs in infinite loop
(C) error: Main method not found
(D) Exception

Level: Expert Category of MCQ: classesAndobjects

Question: 22

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

(A) -null-
(B) - -
(C) --
(D) java.lang.NullPointerException

Level: Expert Category of MCQ: methods

Question: 23

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

(A) Compilation Error
(B) Exception
(C) --
(D) - -

Level: Expert Category of MCQ: methods

Question: 24

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

(A) 77
(B) 78
(C) 79
(D) 710

Level: Expert Category of MCQ: methods

Question: 25

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

(A) 7
(B) 8
(C) 9
(D) 10

Level: Expert Category of MCQ: methods

Question: 26

class ITCompanies{

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

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

(A) Cap Cog
(B) Cap Cap
(C) Cog Cog
(D) Cap Cog Cap Cog

Level: Expert Category of MCQ: classesAndobjects

Question: 27

class ITCompanies{

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

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

(A) Cap Cog
(B) Cap Cap
(C) Cog Cog
(D) Cap Cog Cap Cog

Level: Expert Category of MCQ: classesAndobjects

Question: 28

package com.google.test;

public class Abc {

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

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

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

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

(A) 10203040
(B) 10203040Hello
(C) Hello
(D) None of these

Level: Expert Category of MCQ: classesAndobjects

Question: 29

package com.google.test;

public class Abc {

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

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

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

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

(A) 10203040
(B) 10203040Hello
(C) Hello
(D) Nothing is printed

Level: Expert Category of MCQ: classesAndobjects

Question: 30

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

(A) null
(B) Nothing is printed
(C) Exception
(D) Compilation Error

Level: Expert Category of MCQ: classesAndobjects

Question: 31

package com.google.test;

public class Abc {


public static void main (String []args) {
	

String j = "Ash" ;

switch (j) {

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

}
	
}
}

(A) Ash
(B) Ashxyz
(C) Nothing is printed
(D) AshxyzabcImn

Level: Expert Category of MCQ: switch

Question: 32

Find the output of below Java program -

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

(A) 65 & Infinite loop
(B) 65
(C) Nothing is printed
(D) Compilation Error

Level: Expert Category of MCQ: methods

Question: 33

Find the output of below program 

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

(A) 12345
(B) 1234
(C) Compilation Error
(D) ArrayIndexOutOfBoundsException

Level: Expert Category of MCQ: arrays

Question: 34

Can we override final methods of abstract classes?

(A) Yes
(B) No

Level: Expert Category of MCQ: abstractclass

Question: 35

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

(A) O(1)
(B) O(n)
(C) O(log(n))
(D) None of these

Level: Expert Category of MCQ: collection

Question: 36

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

(A) O(n)
(B) O(1)
(C) O(log(n))
(D) None of these

Level: Expert Category of MCQ: collection

Question: 37

Which collection framework allows null values and is unsynchronized?

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

Level: Expert Category of MCQ: collection

Question: 38

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

(A) Autoboxing
(B) Morphing
(C) Unboxing
(D) Typecasting

Level: Expert Category of MCQ: other

Question: 39

Enum is most useful in creating

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

Level: Expert Category of MCQ: classesAndobjects

Question: 40

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

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

Level: Expert Category of MCQ: exceptions

Question: 41

Which exception is thrown by following code?

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

(A) NumberFormatException
(B) IllegalArgumentException
(C) RuntimeException
(D) ParseException

Level: Expert Category of MCQ: exceptions

Question: 42

Which of the following reference types cannot be generic?

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

Level: Expert Category of MCQ: classesAndobjects

Question: 43

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

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

Level: Expert Category of MCQ: exceptions

Question: 44

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

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

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

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

Level: Expert Category of MCQ: arrays

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Java Multiple Choice Questions for Experts - 44

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