Java Multiple Choice Questions for Experienced

Question: 1

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

(A) 11
(B) 12
(C) 13
(D) Compilation Error

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

Question: 2

Which of these are Access Modifiers in java?

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

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

Question: 3

How many times 'Hello' is printed?

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

(A) 5
(B) 4
(C) 3
(D) 2

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

Question: 4

How many times 'Hello' is printed?

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

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

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

Question: 5

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

(A) 0
(B) 1
(C) 2
(D) 3

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

Question: 6

How many times 'Hello' is printed?

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

(A) 0
(B) 1
(C) 2
(D) Infinite times

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

Question: 7

How many times 'Hello' is printed?

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

(A) 5
(B) 4
(C) 3
(D) 0

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

Question: 8

How many times 'Hello' is printed?

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

(A) 5
(B) 4
(C) 2
(D) 1

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

Question: 9

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

(A) 5
(B) 10
(C) 510
(D) Compilation Error

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

Question: 10

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

(A) 5
(B) 10
(C) 100
(D) 0

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

Question: 11

import java.util.Scanner;

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

(A) Compilation Error
(B) Length is 5-10
(C) Length not in 5-10
(D) nothing is printed

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

Question: 12

public class CppBuzz {

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

(A) 10"10"
(B) Compilation Error
(C) 20
(D) 1010

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

Question: 13

public class CppBuzz {

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

(A) 10-10
(B) 0
(C) 1010
(D) Compilation Error

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

Question: 14

public class CppBuzz {

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

(A) 10+10
(B) 1010
(C) Compilation Error
(D) Undefined

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

Question: 15

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

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

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

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

Question: 16

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

(A) -2
(B) 0-1
(C) 0-2
(D) error: non-static method can't be called

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

Question: 17

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

(A) Compilation Error
(B) 3
(C) 5
(D) 6

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

Question: 18

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

(A) 10.0f
(B) 10.0
(C) 10
(D) error: no suitable method found for toString(float)

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

Question: 19

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

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

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

Question: 20

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

(A) 0
(B) 10
(C) 100
(D) Exception

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

Question: 21

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

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

(A) SunMoon
(B) Sun
(C) Moon
(D) Compilation Error

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

Question: 22

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

(A) Moon
(B) Sun
(C) SunMoon
(D) error: int can not be converted to boolean

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

Question: 23

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

(A) Sun
(B) Moon
(C) SunMoon
(D) Compilation Error

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

Question: 24

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

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

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

Question: 25

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

(A) Compilation Error
(B) Sun
(C) Nothing is printed
(D) error: unreachable statement

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

Question: 26

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

(A) Sun
(B) SunMoon
(C) Nothing is printed
(D) Compilation Error

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

Question: 27

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

(A) error: sum() is private default
(B) hi
(C) Exception
(D) Nothing is printed

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

Question: 28

How many times 'facebook' is printed?

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

(A) 0
(B) 2
(C) 4
(D) 1

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

Question: 29

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

(A) ASISH
(B) asish
(C) HSISA
(D) HSIS

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

Question: 30

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

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

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

Question: 31

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

(A) 3
(B) 5
(C) 18
(D) 16

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

Question: 32

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

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

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

Question: 33

public class Main
{
public static int i = 5;  

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

}

(A) 555
(B) 544
(C) 554
(D) 543

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

Question: 34

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

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

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

Question: 35

What is the use of Garbage Collector in Java?

(A) Automatic Memory Management
(B) Speed-up the Execution of Java code
(C) to handle runtime exceptions
(D) All of these

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

Question: 36

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

(A) Private members can be accessed within a same package
(B) Private members can be accessed within class only
(C) Private members can be accessed within sub classes of same package
(D) All of the above

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

Question: 37

Can we call Constructor without creating an object ?

(A) Yes
(B) No

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

Question: 38

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

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

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

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

Question: 39

Find the output of Java program -

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

(A) AT&T Lab65
(B) AT&T Lab 65
(C) AT&T Lab
(D) Compilation Error

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

Question: 40

Find the output of below Java program-

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

(A) 6565
(B) 65
(C) "65"
(D) None of the above

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

Question: 41

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

(A) 'a'
(B) a
(C) 65
(D) 97

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

Question: 42

Find the output of below program

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

(A) 99
(B) 67
(C) Unpredictable Value
(D) NumberFormatException

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

Question: 43

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

(A) -100
(B) null
(C) -100null
(D) null-100

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

Question: 44

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

(A) -100null
(B) -100
(C) null
(D) Compilation Error - unreachable statement at line 8

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

Question: 45

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

(A) Hello
(B) Compilation Error
(C) Exception
(D) None of these

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

Question: 46

public class Main
{

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

(A) Compilation Error
(B) Exception
(C) Hi
(D) Hello

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

Question: 47

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

(A) 20
(B) 10
(C) Compilation Error
(D) None of the above

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

Question: 48

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

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

(A) Compilation Error
(B) 12345
(C) 246810
(D) Exception

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

Question: 49

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

(A) Yes
(B) No

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

Question: 50

What is the output of below code?

public class Testing {

public static void main (String []args) {

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

System.out.println(readAllFile);

}
}

(A) It reads first line of cppbuzz.txt file
(B) It reads first character of cppbuzz.txt file
(C) It reads all the contents of cppbuzz.txt file
(D) None of these

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

Question: 51

import java.util.*; 

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

(A) Nothing is printed
(B) IndexOutOfBoundsException
(C) Compilation Error
(D) 0

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

Question: 52

Find the output of below program

import java.util.*; 

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

(A) Nothing is printed
(B) Compilation Error
(C) Exception
(D) 5

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

Question: 53

Find the output of below program

import java.util.*; 

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

(A) Nothing is printed
(B) 5
(C) 0
(D) true

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

Question: 54

import java.util.*; 

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

(A) -1
(B) 0
(C) IndexOutOfBoundsException
(D) None of the above

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

Question: 55

Find the output of below program

import java.util.*; 

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

(A) true
(B) -2
(C) Compilation Error
(D) 0

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

Question: 56

Find the output of below program

import java.util.*; 

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

(A) 331
(B) 3321
(C) 310
(D) 321

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

Question: 57

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

(A) True
(B) False

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

Question: 58

How many instances Singleton class can have in Java?

(A) 1
(B) Depends on the calling program
(C) Depends on class creating object of Singleton class
(D) 256

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

Question: 59

import java.util.*;

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

(A) cppbuzz-11
(B) cppbuzz-11.0
(C) hello-11
(D) hello-11.0

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

Question: 60

Find the output of below program

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

(A) class-A class-A
(B) class-B class-B
(C) class-B class-A
(D) class-A class-B

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

Question: 61

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

(A) void methodA(){} int methodA(){}
(B) void methodA(){} void methodA(int a){}
(C) void methodA(){} int methodB(int a){}
(D) int methodA(){} int methodAA(i{}

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

Question: 62

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

(A) True
(B) False

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

Question: 63

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

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

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

Question: 64

Can we define main() method inside abstract class?

(A) Yes
(B) No

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

Question: 65

What is output of below code?

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

(A) Compilation Error
(B) Hello CppBuzz
(C) 13
(D) Hello CppBuzz13

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

Question: 66

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

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

(A) It is not allowed. Compilation Error
(B) It is allowed. CppBuzz
(C) It is allowed. Compilation Error
(D) None of the above

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

Question: 67

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

(A) The main thread waits for other threads to finish
(B) The main thread is finished first then other threads
(C) Other threads will sleep until main is complete
(D) All of these

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

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Java Multiple Choice Questions for Experienced - 67

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