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Java Objective Questions (MCQs) - 225

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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

Level: Practitioner Category: 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

Level: Practitioner Category: 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

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

Question: 124

How many levels of visibility Java has?

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

Level: Beginner Category: 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

Level: Practitioner Category: 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

Level: Beginner Category: 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

Level: Beginner Category: 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

Level: Beginner Category: 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

Level: Expert Category: 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

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

Question: 131

Can we call Constructor without creating an object ?

(A) Yes
(B) No

Level: Practitioner Category: 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

Level: Expert Category: 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

Level: Expert Category: 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

Level: Expert Category: 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

Level: Practitioner Category: 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

Level: Expert Category: 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

Level: Practitioner Category: 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

Level: Practitioner Category: 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

Level: Expert Category: 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

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

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Java Objective Questions (MCQs) - 225

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