Beginner quizzes – Java nested classes

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 Nested And Inner Classes


Quiz 1: A simple inner class.

What happens when you try to compile and run the following program?

class Outer {

	private int x = 12;

	class Inner {
		int x = 4;
		public Inner() {
			this.x += 3;
		private void methodA(int x){
			x = this.x;
			System.out.print("x" + x);
	public static void main(String[] args){
		Inner inner = new Outer().new Inner();

Select the correct answer.

Quiz 2: A simple class with a nested class

What is written to the standard output as the result of executing the following code?

public class Outer {

    private int a = 2;

       a = 5;
    class Nested {
        Nested() {
            a = 3;
    public static void main(String[] args) {
        Nested nested = new Outer().new Nested();

Select the correct answer.

Please, leave your questions, feedback and suggestions in the comments below! 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.

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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