Beginner quizzes – Java inheritance

The following Java exercise(s) are designed for beginner level programmers. If the level is too hard, then I recommend 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: Easy Java Inheritance

What happens when the following program is compiled and run?

public class MySuper {

	protected String s = "Charles";

	void method(){
		System.out.print(s);
	}
}

class MySub extends MySuper {

	String s = "Emma";

	MySub() {
		System.out.print(super.s);
	}
	void method(){
		System.out.print(s);
		super.method();
	}
	public static void main(String[] args){
		MySub mySub = new MySub();
		mySub.method();
	}
}

Quiz 2: Inheriting a super class in Java

What happens when the following program is compiled and run?

public class Super {

	int a = 1;

	Super() {
		a = 5;
	}
}

public class Sub extends Super {

	Sub(int a) {
		System.out.print("-a" + a + "-a" + super.a);
	}
	public static void main(String[] args){
		Sub sub = new Sub(2);
	}
}

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's new book Java quizmaster for beginners (English) Java quizmaster voor beginners (Dutch)

Sar Maroof is the author of two Java books namely, Java quizmaster for beginners and A guide to build a Java application. Experience with developing web applications since 2001 Sun Certified JSP as well as EJB CIW Certified Internet Webmaster Applied Science in Physics HBO Amsterdam As well as Bachellor Science in Physics.

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