// stand alone version of j.n.magee 11/11/96
// by mh 19/03/03
// needs basic understanding of 
//  - package handling
//  - graphical user interfaces
//  - thread programming

//package concurrency;

import java.awt.*;
import java.awt.event.*;
//import concurrency.display.*;

class Rotator implements Runnable { // pattern of behavior

  public void run() {
    try {
      while(true) ThreadPanel.rotate();	// -> concurrency.display
    } catch(InterruptedException e) {}
  }

} // class Rotator


public class ThreadDemoGui  {
  
  public static void main (String[] argv) {

    MyFrame frame = new MyFrame();   
    Panel p = new Panel();
    
    // provided by concurrency.display
    ThreadPanel A = new ThreadPanel("Thread A",Color.blue);
    ThreadPanel B = new ThreadPanel("Thread B",Color.blue);
    
    p.add(A);
    p.add(B);
    frame.add(p);
    frame.setTitle("Thread Demo Using GUI");
    frame.setSize(400,250);
    frame.show(); 
  
    // start 
    A.start(new Rotator());
    B.start(new Rotator()); 
    
 } // main

} // ThreadDemoGui


class MyFrame extends Frame {
  
  public MyFrame() { 

    // this listener closes a frame
    addWindowListener ( new WindowAdapter() { 
        public void windowClosing(WindowEvent e) { System.exit(0); }
    });

  } // MyFrame

} // class MyFrame