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<HTML><HEAD><TITLE>Threaded Labels</TITLE>

</HEAD>

<BODY>

<H1>Threaded Counters</H1>

<P>This demonstrates use of threads to allow several counters

to tick concurrently. Click on any one to start or re-start it.

<HR>

<APPLET CODE="ThrCounter.class" WIDTH=100 HEIGHT=60>

   <PARAM NAME=COUNT VALUE=150>

</APPLET>

<HR>

<APPLET CODE="ThrCounter.class" WIDTH=100 HEIGHT=60>

   <PARAM NAME=COUNT VALUE=200>

</APPLET>

<HR>

/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: ThreadSync.java,v 1.3 2004/02/09 03:34:08 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    do*****entation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*        This product includes software developed by Ian F. Darwin.
* 4. Neither the name of the author nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/

/**
* Threaded demo application, as a Threads subclass.
*
* @author  Ian Darwin
* @version  1.0
*/
public class ThreadSync extends Thread {
  String mesg;
  int count;

  /** Run does the work: print a message, "count" number of times */
  public void run() {
    while (count-- > 0) {
      println(mesg);
      try {
        Thread.sleep(100);  // 100 msec
      } catch (InterruptedException e) {
        return;
      }
    }
    println(mesg + " all done.");
  }

  /* The output routine has been synchronized to interlock the Threads */
  synchronized void println(String s) {
    System.out.println(s);
  }

  /**
   * Construct a ThreadSync object.
   * @param  String m  Message to display
   * @param  int n    How many times to display it
   */
  public ThreadSync(String m, int n) {
    count = n;
    mesg  = m;
    setName(m + " runner Thread");
  }

  /**
   * Main program, test driver for ThreadSync class.
   */
  public static void main(String[] argv) {
    new ThreadSync("Hello from X", 10).start();
    new ThreadSync("Hello from Y", 15).start();
  }
}

/**
* Java Code from Java Cookbook, Second Edition
* By Ian F. Darwin
* Second Edition June 2004
* Series: Cookbooks
* ISBN: 0-596-00701-9
* Details: http://www.oreilly.com/catalog/javacook2/index.html
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*/

/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: ThreadsOne.java,v 1.4 2004/02/09 03:34:08 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    do*****entation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*        This product includes software developed by Ian F. Darwin.
* 4. Neither the name of the author nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/

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

/**
* Threaded Labels: each instance of this class
* runs its own thread, with a counter that counts down to zero.
* <br/>Older version  0.5, July 1997, for JDK1.1
* @author  Ian Darwin
* @version $id$
*/
public class ThreadsOne extends Applet implements Runnable {
  Label lab;
  Button but;
  Thread t;
  int count;

  /** run() - do the work of the thread. Might get confused if
   * the user pushes the button a second time before we finish.
   */
  public void run() {
    int c = count;
    while (c-- > 0) {
      lab.setText(Integer.toString(c));
      try {
        Thread.sleep(100);  // 100 msec
      } catch (Exception e) {
        return;
      }
    }
    System.out.println("All done");
  }

  /** Set the number of times the counter is to decrement */
  public void setCount(int i) {
    count = i;
  }

  /** init() [from Applet] - set up the GUI */
  public void init() {

    // Create the start button.
    add(but = new Button("Start"));
    but.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
      t = new Thread(ThreadsOne.this);
      t.start();
      }
    });

    // Make label large enough to hold three-digit number
    add(lab = new Label("000"));

    // Provide a count from the PARAM, default to 100.
    String snum;
    if ((snum = getParameter("count")) != null)
      setCount(Integer.parseInt(snum));
    else
      setCount(100);
  }
}