Add two Area together in Java

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Area;
/*w ww. ja  v  a2  s.  c o m*/
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;

    Area shape = new Area(new Rectangle(10, 10, 400, 400));
    g2d.draw(shape);
    
    shape.add(new Area(new Rectangle(20, 20, 40, 40)));
    g2d.draw(shape);
  }
}

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);
  }
}