Java puzzle 19: Overloading methods

<< Java Puzzles   Green = Easy,  Blue = Normal,  Red = Hard
 P01   P02   P03   P04   P05   P06   P07   P08   P09   P10   P11   P12   P13   P14   P15   P16   P17   P18   P19   P20   P21   P22   P23   P24 
 By title 

If this code is compiled and run, it writes null3 to the standard output. Write only one statement at line 9. As a result of that statement the output of the program becomes x5.
What is that statement?

Java puzzle 19: Overloading methods

Level: Normal

public class MyClass
  String s;
  int i;
  public void meth()
    i += 3;
    // add your statement here!
    System.out.print(s + i);
  public void meth(String s, int i)
    this.s = s;
    this.i += i;
  public static void main(String[] args)
    MyClass mc = new MyClass();

Author: Sar Maroof

Answer explanation

  1. To solve this puzzle we need to reassign the instance variables str and i.
  2. To do that with only one statement we need to use the method myMethod with two parameters.
    if we pass the parameters x and 5, the output becomes x8, because the statement i += 3; increments the value of i by 3.
    Therefore we pass the parameters x and 2 to the method as follows.
    The correct answer is:  meth(“x”, 2);

If you found this difficult, you might consider reading my book Java quizmaster for beginners. It is easy to understand, 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". 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.

Books by Sar Maroof


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

Leave a Reply

Your email address will not be published.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

Sarmaroof © 2017