Grow a rectangle in Java

//ww w.j a v  a2 s .c  o  m
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Rectangle r = new Rectangle(100, 100, 200, 200);
    System.out.println(r);
    r.grow(50, 75);
    g.drawRect(r.x, r.y, r.width, r.height);
    r.grow(-25, -50);
    g.drawRect(r.x, r.y, r.width, r.height);
    
  }
}

public class Main {
  public static void main(String[] a) {
    JFrame window = new JFrame();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setBounds(30, 30, 450, 450);
    window.getContentPane().add(new MyCanvas());
    window.setVisible(true);
  }
}