🚀 go-pugleaf

You should use the Thread.interrupt method instead of Object.notify.
Here is a sample:

// BEGIN wakethr.java
import java.awt.*;
import java.awt.event.*;

public class wakethr extends Frame
{
  public static void main(String args[])
  {
    Frame MyFrame = new wakethr();
    MyFrame.show();
  }

  Button wakeBut = new Button();
  Button exitBut = new Button();
  SleeperThread MySleeper = new SleeperThread();

  wakethr()
  {
    exitaction quit = new exitaction();

    setTitle("Interrupt Thread Demo");
    setSize(400,100);
    setLocation(100,100);
    setLayout(new BorderLayout());
    addWindowListener(quit);
    
    wakeBut.setLabel("Wake Thread");
    wakeBut.addActionListener(new wakeaction(MySleeper));
    add(wakeBut,BorderLayout.CENTER);
    
    exitBut.setLabel("Exit");
    exitBut.addActionListener(quit);
    add(exitBut,BorderLayout.EAST);

    MySleeper.start();
  }
}

class exitaction extends WindowAdapter implements ActionListener
{
  public void actionPerformed(ActionEvent e)
  {
    System.exit(0);
  }

  public void windowClosing(WindowEvent e)
  {
    System.exit(0);
  }
}

class wakeaction implements ActionListener
{
  Thread wakeThread;

  wakeaction(Thread t)
  {
    wakeThread = t;
  }

  public void actionPerformed(ActionEvent e)
  {
    wakeThread.interrupt();    
  }
}

class SleeperThread extends Thread
{
  public void run()
  {
    while (true)  {
      System.out.println("I'm going to sleep for 10 seconds.");
      try {
        Thread.sleep(10000);
      }
      catch (InterruptedException e)  {
        System.out.println("My sleep was interrupted.");
      }
      System.out.println("I'm awake!!");
    }   
  }
}
// END wakethr.java

On Tue, 27 Apr 1999 15:55:44 -0400, Tom Heagy <tom.heagy@sciatl.com>
wrote:

>I'm trying to find a way to wake up a sleeping thread and I'm missing
>something that is probably obvious to someone else.
>
>I have a little test project where I've created an object (Sleeper) that
>extends "Thread" and does nothing more than the following in it's run
>method:
>
>    while (true)  {
>      System.out.println("I'm going to sleep for 10 seconds.");
>      try {
>        Thread.sleep(10000);
>      }
>      catch (InterruptedException e)  {
>        System.out.println("My sleep was interrupted.");
>      }
>      System.out.println("I'm awake!!");
>    }
>
>Nothing special here and this obviously works as desired.  It wakes up
>every 10 seconds and prints it's messages.  Now, my problem comes into
>play when I want to wake up the thread BEFORE it does itself.  I thought
>this was possible through the "notify" method.  I have another class
>(with a Main method) that instantiates a Sleeper object and executes the
>"notify" method when a user clicks a button.  When I do this however, I
>get the message that states "Current thread not owner".
>
>I guess my bottom line is- "How do I become the owner of this thread?"
>I own the original handle to the sleeper object.  What else do I need to
>do?
>
>Thanks in advance for your input.
>
>-Tom
>

Chris Hill
Chris244@aol.com