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Beginner Quizzes – Java Interfaces

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 Interfaces

Article: Java interfaces
Quizzes: Beginner  Intermediate  Advanced

interface-green

Quiz 1: Easy Java Interface

What happens when the following program is compiled and run?

public interface MyInterface {

	int SMALL_NUMBER = 2;
	int NUMBER = 6;
	int getSum(int nr1, int nr2, int nr3);
}

public class MyClass implements MyInterface {

	public int getSum(int a, int b, int c){
		return NUMBER * a + b - SMALL_NUMBER / c;
	}
	public static void main(String[] args){
		MyClass mc = new MyClass();
		int x = mc.getSum(2,5,2);
		System.out.print(x);
	}
}

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!

Quiz 2: Implementing an interface in Java

What happens when the following program is compiled and run?

public interface MyInterface {

	int NUMBER = 4;
	String s = "x";
	void setMethod();
	void setMethod(String s, int n);
}

public class MyClass implements MyInterface {

	int NUMBER = 2;
	String s = "y";

	public void setMethod(){
		System.out.print("-" + MyInterface.s + NUMBER);
	}
	public void setMethod(String s, int n){
		System.out.print("-" + s + MyInterface.NUMBER);
	}
	public static void main(String[] args){

		MyClass mc = new MyClass();
		mc.setMethod();
		mc.setMethod("z",7);
	}
}

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!

Megisoft.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. 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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