Advanced quizzes – Java inheritance

The following Java exercise(s) are designed for advanced level developers. If the level is too hard, then I recommend to select an easier one or you might consider reading my article about this topic, which offers a theoretical explanation including more exercises. Read More: Java Inheritance.


Quiz 1: Inheritance, accessing methods and constructors of a super class.

What happens when the following program is compiled and run?

public class SuperB {

	protected int a = 2;
	protected int b = 3;

	public SuperB() {
		a += 1;
		b += 2;
		System.out.print("-b" + b);
	public SuperB(int i) {
		b -= 1;
		System.out.print("-b" + a);
		a -= 1;
	public int getB(){
		this.a += 2;
		this.b += 4;
		return b - a;

public class SuperA extends SuperB {

	int a;
	int b = 1;

	public SuperA() {
		a += 7;
		b += 5;

public class MySub extends SuperA {

	public MySub() {
		System.out.print("-b" + a);
		System.out.print("-b" + b);
		System.out.print("-b" + getB());
	public static void main(String[] args){
		MySub mySub = new MySub();

Select the correct answer.

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Sar Maroof is graduated from HBO Amsterdam "higher professional education". He is a professional computer programming teacher, gives master classes and publishes technical articles. His experience with developing software started from 2001 and he has worked as a software developer for several big as well as small companies and later as a freelancer. He is the author of Java quizmaster and Build a Java application in 7 days.

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1 Comment

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  1. That’s 2 clever by half and 2×2 clever 4 me. Thnska!

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