Advanced quizzes – Java nested classes

The following Java exercise(s) are designed for advanced level developers. 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 Nested And Inner Classes


Quiz 1: A nested class inside another nested class

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

class Outer {

	public int x;
	private int y;

	Outer() {
		x += 1;
		y += 4;
	class InnerA {
		InnerA() {
			x += 2;
			InnerB innerB = new InnerB(1);
			System.out.print("-x" + x);
		class InnerB {
			InnerB() {
				x += 3;
				y -= 1;
				System.out.print("-x" + x + "-x" + y);
			InnerB(int i) {
				x -= i;
			private void method(){
				y += 1;
				System.out.print("-x" + y);
	public static void main(String[] args){
		InnerA innerA = new Outer().new InnerA();

Select the correct answer.

Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer.
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  1. All of these articles have saved me a lot of heedschaa.

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