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Java Objective Questions (MCQs) - 225

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Question: 61

What is default value of variable a in following code?

public class Main
{
private int a;

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

(A) Garbage Value
(B) Code has compilation error
(C) null
(D) 0

Level: Beginner Category of MCQ: variables

Question: 62

What should be value of variable a?
 public class Main
{
public static void main(String[] args) {
    int a;
    System.out.println(a);
}
}

(A) Garbage Value
(B) 0
(C) Undefind
(D) Compilation Error

Level: Beginner Category of MCQ: variables

Question: 63

public class Main
{
private int a;    

public Main(){
    a = 10;
}

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

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

Level: Beginner Category of MCQ: classesAndobjects

Question: 64

public class Main
{

public static void main(String[] args) {
    final int a = 5;
    a = 10;
    System.out.println(a);
}

}

(A) 5
(B) 10
(C) Error: Can't assign a value to final variable a
(D) None of the above

Level: Beginner Category of MCQ: variables

Question: 65

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

(A) 0
(B) 10
(C) Undefind
(D) Error: Can't modify final variable a

Level: Beginner Category of MCQ: variables

Question: 66

public class Main
{
public static void main(String[] args) {
    final int a;
    a = 5;
    a = 10;
    System.out.println(a);
}
}

(A) 5
(B) 10
(C) 0
(D) Error: variable a might already have been assigned

Level: Beginner Category of MCQ: variables

Question: 67

How many times 'cppbuzz' is printed?
public class Main
{
public static void main(String[] args) {
	while(true){
	    System.out.println("cppbuzz");
		}
	}
}

(A) 1
(B) 2
(C) Compilation Error
(D) Infinite times

Level: Beginner Category of MCQ: loops

Question: 68

How many times 'cppbuzz' is printed?

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

(A) 0
(B) 1
(C) Infinite Times
(D) Error: Unreachable Statement

Level: Beginner Category of MCQ: loops

Question: 69

How many time 'cppbuzz' is printed?

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

(A) Infinite times
(B) 0 times
(C) 1 time
(D) error: unreachable statement

Level: Beginner Category of MCQ: loops

Question: 70

How many times 'cppbuzz' is printed?

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

(A) Infinite times
(B) 0
(C) 1
(D) error: unreachable statement

Level: Beginner Category of MCQ: loops

Question: 71

How many times 'cppbuzz' is printed?

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

(A) 0
(B) 1
(C) Infinite Times
(D) Compilation Error

Level: Beginner Category of MCQ: loops

Question: 72

public class Main
{

public static void sum(int a, int b){
        System.out.print(a+b);
    }

public static void main(String[] args) {
		sum(0,0);
		sum(-1,-1);
	}
}

(A) 00
(B) 0-1
(C) 0-2
(D) -2

Level: Beginner Category of MCQ: methods

Question: 73

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

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

Level: Practitioner Category of MCQ: methods

Question: 74

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

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

Level: Practitioner Category of MCQ: methods

Question: 75

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

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

Level: Expert Category of MCQ: methods

Question: 76

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

(A) 32136
(B) 33126
(C) 12336
(D) 63321

Level: Beginner Category of MCQ: methods

Question: 77

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

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

Level: Expert Category of MCQ: methods

Question: 78

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

(A) 12
(B) 01
(C) 11
(D) 10

Level: Beginner Category of MCQ: methods

Question: 79

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

(A) Yes
(B) No

Level: Beginner Category of MCQ: methods

Question: 80

public class Main
{   
public static void main(String[] args) {
		String str = "1234";
		int a = Integer.parseInt(str);
		System.out.println(a);
	}
}

(A) 123
(B) 1234
(C) 12340
(D) Compilation Error

Level: Beginner Category of MCQ: typecasting

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Java Objective Questions (MCQs) - 225

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