Re: calling SwingWorker c

"Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this>
Wed, 27 Apr 2011 15:32:53 GMT
  To: wrote:

is there anyway, i can wait for the swing worker to really complete,
after i call the cancel method? this is my swing worker will only
terminate, only if i call cancel()...

            while (! isCancelled()) {
        // swing worker is doing something....


You will know that marketTask is canceled by checking the return value
of cancel(). Calling get() will not block. It will just throw a

Is there any way I can "wait", until the task is really completed
after I make a call to cancel? My task is running in a infinity loop :

If your task is an infinite loop then you don't need SwingWorker. Just
use a Runnable and start it running with a thread. Then when you are
done, signal it to stop either by interrupting it, setting a flag or
causing some sort of exception to be thrown.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test5 implements Runnable {
     volatile boolean runFlag = true;
     Thread thread;

     public void run() {
         // once started this thread will run as long as runFlag is true
         while (runFlag) {
             // do your processing here, this example just sleeps
             try {
             } catch (InterruptedException ie) { }
         System.out.println("process stopped");

     public static void main(String[] args) {
         // create the gui
         Runnable r = new Runnable() {
             public void run() {
                 final test5 t5 = new test5();
                 final JFrame f = new JFrame();
                 // leave the window open when the X is clicked
                 f.addWindowListener(new WindowAdapter() {
                     public void windowClosing(WindowEvent we) {
                         // start another thread here so as not to
                         // block the EDT
                         Runnable r = new Runnable() {
                             public void run() {
                                 // tell the loop to end
                                 t5.runFlag = false;
                                 // join this thread and the task thread
                                 // this will wait here until the other
                                 // thread is finished or this thread is
                                 // interrupted
                                 try {
                                 } catch (InterruptedException ie) { }
                                 // close the program
                         // start the runnable above to end the program
                         new Thread(r).start();
                         // show a dialog to let users know what is
                         // happening
                         JDialog d = new JDialog(f,false);
                         JLabel l = new JLabel("Shutting Down");

                 // start the task running
                 t5.thread = new Thread(t5);


Knute Johnson
email s/nospam/knute/

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