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Intermediate Quizzes – Java Interfaces

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 Interfaces

Article: Java interfaces
Quizzes: Beginner  Intermediate  Advanced


Quiz 1: Implementing interfaces in Java

What happens when the following program is compiled and run?

public interface InterfaceB {

	int NUMBER = 1;
	int method();

public interface InterfaceA extends InterfaceB {

	int NUMBER = 4;

public class MyClass implements InterfaceA {

	int NUMBER = 2;

	public int method(){
		return NUMBER;
	public static void main(String[] args){
		InterfaceA iA = new MyClass();
		InterfaceB iB = new MyClass();
		MyClass mc = new MyClass();
		System.out.print("-v" + mc.NUMBER + "-m" + iB.method());
		System.out.print("-v" + iA.NUMBER + "-m" + iA.method());
		System.out.print("-v" + iB.NUMBER + "-m" + iB.method());

Select the correct answer.

Please, leave your questions, feedback and suggestions in the comments below! If you need more explanation by any of the answers, just let me know to update it for you! 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. The author of Megisoft is Sar Maroof who has more than a decade of experience with web development mainly with Java, MySql, HTML and more..
Article: Java interfaces
Quizzes: Beginner  Intermediate  Advanced

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Click Here For Info about: Sar Maroof's New Java Book
Author: Sar Maroof
More than a decade of experience with developing web applications mainly with Java.
Sun Certified JSP as well as EJB
CIW Certified Internet Webmaster - Mind IT
Applied Science in Physics HBO Amsterdam
Bachellor Science in Physics at Basra university.
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1 Comment

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  1. I’m so glad I found my solituon online.

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