/******************************************************************
 * @(#) Threads.java     1.0
 *
 * Copyright (c) 2003 John Miller
 * All Right Reserved
 *-----------------------------------------------------------------
 * Permission to use, copy, modify and distribute this software and
 * its documentation without fee is hereby granted provided that
 * this copyright notice appears in all copies.
 * WE MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
 * OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. WE SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY ANY USER AS A RESULT OF USING,
 * MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 *-----------------------------------------------------------------
 *
 * @version     1.0, 30 Mar 2003
 * @author      John Miller
 */

import static java.lang.System.*;

/******************************************************************
 * This class illustartes simple thread synchronization.
 */
public class Threads
{
    /**************************************************************
     * Inner class for Thread1.
     */
    public class Thread1 extends Thread
    {
        public void run ()
        {
            out.println ("Thread 1 in stage 1");
            thread2.start ();
            synchronized (this) {
                try { wait (); } catch (InterruptedException ex) {}
            } // synchronized
            out.println ("Thread 1 in stage 2");
//          thread2.interrupt ();
            synchronized (thread2) { thread2.notify (); } 
        } // run

    } // Thread1 inner class


    /**************************************************************
     * Inner class for Thread2.
     */
    public class Thread2 extends Thread
    {
        public void run () 
        { 
            out.println ("Thread 2 in stage 1"); 
//          thread1.interrupt ();
            synchronized (thread1) { thread1.notify (); }
            synchronized (this) { 
                try { wait (); } catch (InterruptedException ex) {}
            } // synchronized
            out.println ("Thread 2 in stage 2");
        } // run 
 
    } // Thread2 inner class

    private Thread thread1 = new Thread1 ();
    private Thread thread2 = new Thread2 ();

    /**************************************************************
     * Main method for running Threads application.
     * @param args  the command-line arguments
     */
    public static void main (String [] args)
    {
        out.println ("Threads trace begin"); 
        Threads test = new Threads ();
        test.thread1.start ();

    } // main

} // Threads class