Java - this.

class Exam01_sub{
 private int x;
 private int y;
 public Exam01_sub()
 {
  this.x=100;
  this.y=200;
 }
 public void setXY(int x,int y)
 {
  this.x = x;
  this.y = y;
 }
 public void disp()
 {
  System.out.println("x=" + this.x);
  System.out.println("y=" + this.y);
 }
}

public class thisp{
 public static void main(String[] arg)
 {
  Exam01_sub ex = new Exam01_sub();
  ex.disp();
  ex.setXY(10,20);
  ex.disp();
 }
}