import java.awt.*;  
import java.awt.image.*;  
import java.awt.event.*; 
import java.util.*;  
import java.applet.*;  
import java.net.*;  
import java.awt.Component.*; 
import java.awt.Color.*; 
import java.awt.Graphics; 
import java.util.Random; 
import java.lang.Math; 
import java.awt.event.WindowListener; 
import java.applet.AudioClip;

// example book Java in a Nutshell by David Flanagan.
// modified by Dr. Roger Webster 

public class simplethread extends Applet
{
      Frame window;
      Button openbutton;
      Button closebutton;
	TextArea textarea = new TextArea(24, 80);
	public Mythread b;
	public Mythread c;

	public void init() 
	{		
		b = new Mythread("Thread 1");
		b.start();
		c = new Mythread("Thread 2");
		c.start();
        	openbutton = new Button("KILL Thread1");
        	closebutton = new Button("KILL Thread2");
        	this.add(openbutton);
        	this.add(closebutton);
        	window = new Frame ("Webster's Sample Java Thread Window");
        	window.reshape (100, 100, 400, 400);
	  	textarea.setFont(new Font("Helvetica", Font.PLAIN, 12));
	  	textarea.setEditable(false);
        	window.add("Center", textarea);
        	textarea.appendText("hello World Thread example\n");
		textarea.appendText("this is the Applet \n");
        	window.show();

  	}

        public void stop() 
        {
                	window.dispose();
			b.killme();
			c.killme();
        }

        // action -  a button pressed.
        public boolean action(Event event, Object arg) 
        {
                if (event.target == closebutton)
                {
                        //window.hide();
				c.killme();

                }
                if (event.target == openbutton)
                {
                       	b.killme();
 			//	window.show();
                }

                return true;
        }

        // user presses a mouse button.
        public boolean mouseDown(Event e, int x, int y) 
        {
                return true;
        }

	class Mythread extends Thread
	{ 
		long mytime;	
  	  	boolean keeprunning = true;

		public Mythread (String name)
		{
			super (name);
	
		}//end constructor

		public void killme()
		{
		 	keeprunning = false;
		}

		public void run()
		{
			while (keeprunning)
			{
				
				try
				{
					mytime = (long)(Math.random() * 1000);
					Thread.sleep(mytime);
				}
				catch (Exception e) 
				{ System.out.println("exception in thread sleep" + e.toString());}

				textarea.appendText("this is "+ this.getName()+" sleeptime is:" + mytime + "\n");
			}

		}//end run

	}//end mythread

}//end applet