Intermediate quizzes – Java inheritance

The following Java exercise(s) are designed for intermediate level programmers. 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 constructors of super classes?

What happens when the following program is compiled and run?

public class SuperB {

	protected int b = 3;

	public SuperB() {
		b += 3;
		System.out.print("-b" + b);
	}
	public SuperB(int i) {
		this();
		b += 2;
		System.out.print("-b" + b);
	}
}

public class SuperA extends SuperB {

	int b = 4;

	public SuperA() {
		super(3);
		b += 1;
	}
}

public class MySub extends SuperA {

	public MySub() {
		b += 2;
		System.out.print("-b" + b);
	}
	public static void main(String[] args){
		MySub mySub = new MySub();
	}
}

Article: Java inheritance Quizzes: Beginner  Intermediate  Advanced

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Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer.

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