Cancel anonymous SwingWorker thread?

Question

Hello,
A beginner question.
I have a button (A) calling a method, lets call it private void B().
Inside the method B() I have this:
SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() { do some stuff }
Anyway when I click the A button it calls the method b() and it works fine, the worker thread goes off and does what it needs to do.
If I want to implement a Cancel button to cancel the SwingWorker thread started by private void B(), how should I do it?
Thanks :)

Answer 1

Using SwingWorker is rather neat, and surprisingly studious for a beginner. Make sure that you do non-Swing related work in doInBackground() and Swing-related stuff in done(), that mostly what SwingWorker is for.Yes, that is the way I'm using it together with setProgress to update a progress bar.Great. I hadn't even ever noticed the existence of this method! I learn someting new everyday.
So, you're well ahead of me in terms of using the SwingWorker API! ;)
Your problem is definitely with the Java lanuage, not the SwingWorker.
Instead of using a local variable, make worker an attribute (of the class in which method b() is defined). Then in the action listener for the "Cancel" button, you can invoke the worker's cancel(boolean) method.
I'm not quite sure what you mean exactly when you say an attribute. The method b() is defined within the class that displays the Swing GUI:
public class ResyncWindow extends javax.swing.JFrame { } Do you want me to put the worker outside any methods?Yes, like this:
public class ResyncWindow extends javax.swing.JFrame {
    SwingWorker<Void, Void> worker;
    public ResyncWindow() {
        ... // create launchButton, and wire its actionListener to trigger b()
        ... // create cancelButton, and wire its actionListener to trigger cancel()
    private void b() {
        worker = new SwingWorker<Void,Void>() {
            public void doInBackground() {
                while (!isCancelled() { ..do stuff and set progress... }
        worker.execute();
        cancelButton.setEnabled(true);
        launchButton.setEnabled(false);
    private void cancel() {
         if (!worker.cancel()) {
             ... // display error
         cancelButton.setEnabled(false);
         launchButton.setEnabled(true);
}