Java quiz 22: Handling inner classes

Java Quizzes:  Green = Easy,  Blue = Normal,  Red = Hard
 Q01   Q02   Q03   Q04   Q05   Q06   Q07   Q08   Q09   Q10   Q11   Q12   Q13   Q14   Q15   Q16   Q17   Q18   Q19   Q20   Q21   Q22   Q23   Q24   By title 

This code shows handeling inner classes in Java. You have to store the whole code
in one file with the name Outer.

Java quiz 22: Handling inner classes

Level: Normal

What happens if the following code is compiled and run?

public class Outer
  int x;
  int y;
  Outer(int x, int y)
    x += 2;
    y += 3;
    System.out.print("x" + this.x + ", ");
    System.out.print("y" + this.y + ", ");
  class Inner
      x += 3;
      y += 2;
      System.out.print("x" + x + ", ");
      System.out.print("y" + y);
  public static void main(String[] args)
    Inner inner = new Outer(4, 5).new Inner();
Author: Sar Maroof

Select the correct answer.

Answer explanation

  1. The statement new Outer(4, 5) calls the two argument constructor of the Outer class.
  2. The statement x += 2; and y += 3; incremnts the value of the parameters x and y by 2 and 3 respectively.
  3. The statement System.out.print(“x” + this.x + “, ” + “y” + this.y + “, “); writes the values of the instance variables x and y to the standard output, which are respectively 0 and 0. Therefore the statement writes x0, y0 to the standard output.
  4. The statments x += 3; and y += 2; increments the values of the instance variables x and y by 3 and 2 respectively.
  5. The statement System.out.print(“x” + x + “, ” + “y” + y); writes the values of the instance variables x and y to the standard output, So, it writes x3, y2 to the standard output.

The correct answer is: d.


If you found this difficult, you might consider reading my book Java quizmaster for beginners. It is easier and organized to learn Java in 17 days and it guides you to master Java code by solving 105 quizzes and 117 assignments. This book explains each chapter properly before starting with exercises and assignments. It is available on Amazon. See inside the book here!

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” when he already had a bachelor of science degree in Physics.
He is a SUN certified JSP as well as EJB. He has experience with Java since 2001 and worked 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.

Books by Sar Maroof


 Subscribe to Sar Maroof's RSS feeds!
 Mail this page to a friend!
 Bookmark this page!

Share on FacebookTweet about this on TwitterShare on RedditShare on LinkedIn

Leave a Reply

Your email address will not be published. Required fields are marked *

Sarmaroof © 2017