Java puzzle 26: Invoking a method within a method

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This code demonstrates invoking a method within another method.

Java puzzle 26: Invoking a method within a method

Level: Normal

What is the output of this program and why?

public class MyClass
{
  int x = 2;
  int y = 5;
  
  void myMethod(int x, int y)
  {
    this.x += x;
    this.y += y;
  }
  void print()
  {
    myMethod(3, 1);
    System.out.print("x" + x + "y" + y);
  }
  public static void main(String[] args)
  {
    new MyClass().print();
  }
}

Author: Sar Maroof

Answer explanation

1. The statement myMethod(3, 1); invokes the method myMethod. The statement this.x += x; adds the value of the parameter x to the value of the instance variable x. So, x = the initial value of x + 3 = 2 + 3 = 5.
2. The statement this.y += y; adds the value of the parameter y to the value of the instance variable y. So, y = its initial value + 1, y = 5 + 1 = 6.
3. So, the statement System.out.print(“x” + x + “y” + y); writes x5y6 to the  standard output.

The correct answer is: x5y6

 

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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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