voila qq précsions par rapport à ton premier post :

la classe ThraedWorker :

import javax.swing.SwingUtilities;

public abstract class ThreadWorker {
    private Object value;  // see getValue(), setValue()
    private Thread thread;

    /**
     * Class to maintain reference to current worker thread
     * under separate synchronization control.
     */
    private static class ThreadVar {
        private Thread thread;
        ThreadVar(Thread t) { thread = t; }
        synchronized Thread get() { return thread; }
        synchronized void clear() { thread = null; }
    }

    private ThreadVar threadVar;

    /**
     * Get the value produced by the worker thread, or null if it
     * hasn't been constructed yet.
     */
    protected synchronized Object getValue() {
        return value;
    }

    /**
     * Set the value produced by worker thread
     */
    private synchronized void setValue(Object x) {
        value = x;
    }

    /**
     * Compute the value to be returned by the <code>get</code> method.
     */
    public abstract Object construct();

    /**
     * Called on the event dispatching thread (not on the worker thread)
     * after the <code>construct</code> method has returned.
     */
    public void finished() {
    }

    /**
     * A new method that interrupts the worker thread.  Call this method
     * to force the worker to stop what it's doing.
     */
    public void interrupt() {
        Thread t = threadVar.get();
        if (t != null) {
            t.interrupt();
        }
        threadVar.clear();
    }

    /**
     * Return the value created by the <code>construct</code> method.
     * Returns null if either the constructing thread or the current
     * thread was interrupted before a value was produced.
     *
     * @return the value created by the <code>construct</code> method
     */
    public Object get() {
        while (true) {
            Thread t = threadVar.get();
            if (t == null) {
                return getValue();
            }
            try {
                t.join();
            }
            catch (InterruptedException e) {
                Thread.currentThread().interrupt(); // propagate
                return null;
            }
        }
    }


    /**
     * Start a thread that will call the <code>construct</code> method
     * and then exit.
     */
    public ThreadWorker() {
        final Runnable doFinished = new Runnable() {
           public void run() { finished(); }
        };

        Runnable doConstruct = new Runnable() {
            public void run() {
                try {
                    setValue(construct());
                }
                finally {
                    threadVar.clear();
                }

                SwingUtilities.invokeLater(doFinished);
            }
        };

        Thread t = new Thread(doConstruct);
        threadVar = new ThreadVar(t);
    }

    /**
     * Start the worker thread.
     */
    public void start() {
        Thread t = threadVar.get();
        if (t != null) {
            t.start();
        }
    }
}

donc la méthode finished() est bien appelée apres la methode run, non?

ah, ok, je savais pas...

il faut que je fasse quelque chose du genre

java.awt.EventQueue.invokeLater(new Runnable){
run(){
setEnabled(true)....
}}

Il faut aussi que j'enleve threadworker .... et que je fasse plutot :

public void appelleWS{
      resultingGraph = transitionGraph.exportToCADP();//appel et execution du service web
      java.awt.EventQueue.invokeLater(new Runnable){
           run(){
                 exportButton.setEnabled(true);
                 abortButton.setEnabled(false);
                 if ( txtStatus.getText().equals(RUNNING) ) {
                      txtStatus.setText(FINISHED);
                      setResultsPanel();
                 }
           }
        };
   } 

Est-ce que c'est ca que je dois faire?
et la, java sais qu'il faut d'abord faire "resultingGraph=..." avant de mettre à jour les boutons et tout ca?

malheureusement, je ne l'ai pas, je me suis abonnée a partir du 80!

Merci