import java.awt.*;
import java.applet.*;

public class mRectApplet extends Applet implements Runnable {

  // Instance variables:
  Thread thread;
  mPoint object[] = new mPoint[2];

  // Class method:
  public void initObjects() {
    object[0] = new mRectangle(10,10,100,100);
    object[0].setDelta(1,1);
    object[0].setColor(Color.red);
    
    object[1] = new mRectangle(200,10,100,100);
    object[1].setDelta(-1,1);
    object[1].setColor(Color.blue);
  }

  // Override java.applet.Applet.init:
  public void init () {
    initObjects();
  }

  // Override java.applet.Applet.start:
  public void start() {
    if (thread == null) {
      // Reinitialize:
      initObjects();
      thread = new Thread(this);
      thread.start();
    }
  }

  // Override java.applet.Applet.stop:
  public void stop() {
    if (thread != null) {
      thread.stop();
      thread = null ;
    }
  }

  // Implement java.lang.Runnable.run:
  public void run() {
    while(thread != null) {
      // repaint() invokes update():
      repaint();
      try {
        Thread.sleep(20);
      } 
      catch(InterruptedException e) {
        // Do nothing   
      };
    }
  }

  // Override java.awt.Component.paint:
  public void paint (Graphics g) {
    g.setColor(Color.black);
    g.fillRect(0, 0, size().width, size().height);
    for (int i=0; i<2; i++)
      object[i].paint(g);
  }

  // Override java.awt.Component.update:
  public void update(Graphics g) {
    g.setColor(Color.black);
    g.fillRect(0, 0, size().width, size().height);
    for(int i=0; i<2; i++)
      object[i].move(g);
  }

}