// this version works with Java 1.0 (e.g. VJ++ 1.1)
import java.awt.*;
import java.applet.*;
// this version doesn't have thread
public class RedGreenV110 extends Applet
{
   public void init()
   {
       setLayout(new BorderLayout(2,2));
       b = new Button("start");
       c = new Canvas();
       add("West", b);
       add("Center", c);
   } // init

   public void paint(Graphics g)
   {
       Graphics gc = c.getGraphics();
       while (keepGoing)
       {
	   gc.setColor(new Color(200, 50, 50));
	   gc.fillRect(5,5,90,40);
	   gc.setColor(new Color(50, 200, 50));
	   gc.fillRect(5,5,90,40);
       }  // while
   }  // paint

   public boolean handleEvent(Event ae)
   {
       if (ae.id == Event.WINDOW_DESTROY)
	   System.exit(0);
       return super.handleEvent(ae);
   } // handleEvent

   public boolean action(Event ae, Object s)
   {
	   if (s.equals("start"))
	       handleStart();
	   else if (s.equals("stop"))
	       handleStop();
	   else return super.action(ae, s);
       return true;
   }  // action

   private void handleStart()
   {
       keepGoing = true;
       b.setLabel("stop");
   } // handleStart

   private void handleStop()
   {
       keepGoing = false;
       b.setLabel("start");
   } // handlStop

   // instance variables
   private Button b;
   private Canvas c;
   private boolean keepGoing = false;
} // RedGreenV110