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.

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();
	}
}

Select the correct answer.

a. This program is illegal at compile time.

b. This program is illegal at run time.

c. This program writes “-b6” to the standard output.

d. This program writes “-b6-b5” to the standard output.

e. This program writes “-b6-b8-b7” to the standard output.

f. This program writes “-b6-b8-b5” to the standard output.

g. This program writes “-b6-b8-b4” to the standard output.

h. This code writes “null” to the standard output.

i. This code writes nothing to the standard output.

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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