Intermediate quizzes – Java classes and objects

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 Classes And Objects.


Quiz 1: Instantiating an object

What happens when the following program is compiled and run?

public class MyClass {

	int m = 4;
	int n = 5;
	String s = "z";

	MyClass(int m, int n, String s) {
		m -- ;
		System.out.print("-x" + m);
		this.n = 2;
		this.s = s;
		System.out.print("-x" + n);
		this.m += 2;
	void method(int m, int n, String s){
		this.s = s;
		System.out.print("-x" + this.m + "-x" + this.n);
	public static void main(String[] args){
		MyClass mc = new MyClass(1,6,"h");

Select the correct answer.

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Sar Maroof is graduated from HBO Amsterdam "higher professional education". He is a professional computer programming teacher, gives master classes and publishes technical articles. His experience with developing software started from 2001 and he has worked as a software developer for several big as well as small companies and later as a freelancer. He is the author of Java quizmaster and Build a Java application in 7 days.

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