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.

Article: Java inheritance Quizzes: Beginner  Intermediate  Advanced

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) {
		this();
		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() {
		super(3);
		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();
	}
}

Please, leave your questions, feedback and suggestions in the comments below!
SarMaroof.com offers a practical method to learn and improve your Java skills. It avoids unnecessary long boring theoretical explanations, but it uses many exercises and quizzes.

Article: Java inheritance Quizzes: Beginner  Intermediate  Advanced

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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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