java - PropertyChanged 未触发。

Question

Web_Reader 类是 Swing Worker，其“doInBackground”如下所示。为什么“this.setProgress”没有触发“propertyChange”方法？从我读过的内容来看，我已经正确实施。

   public class Web_Reader extends SwingWorker implements ACL_Form_Fetcher, PropertyChangeListener {}



    @Override
protected ACL_Form_Collection doInBackground() throws Exception {

    // setProgress(0);
    ACL_Form_Collection data = new ACL_Form_Collection();
    double numberOfForms = 0;
    ArrayList<String> input = this.readFromWeb(this.ticketNumber);
    double inputs = (double) input.size();
    while (numberOfForms <input.size() && !isCancelled()) {
        for (int i = 0; i < input.size(); i++) {
            int v = (int) (((double) numberOfForms / inputs) * 100);
            this.setProgress(v);
            Thread.sleep(5000);
            String get = input.get(i);
            //Create Form
            ACL_Form form = this.getForm(i, get);
            data.add(form);
            //Callables are added to executor and execution begins

            //  p.setNote(message);
            ++numberOfForms;

        }
        this.setProgress(100);
        //shut down executor here
    }

    return data;
}

这是位于“Web_Reader”中的属性更改方法

 @Override
public void propertyChange(PropertyChangeEvent evt) {
    System.out.println("evt= "+evt);
    if ("progress" == evt.getPropertyName()) {
        int progress = (Integer) evt.getNewValue();
        progressMonitor.setProgress(progress);
        String message = String.format("Completed %d%%.\n", progress);
        progressMonitor.setNote(message);
        System.out.println("Message= "+message);
        if (progressMonitor.isCanceled() || ACL_Maker.executor.isDone()) {
            Toolkit.getDefaultToolkit().beep();
            if (progressMonitor.isCanceled()) {
                ACL_Maker.executor.cancel(true);
                // taskOutput.append("Task canceled.\n");
            } else {
                // taskOutput.append("Task completed.\n");
            }
            //startButton.setEnabled(true);
        }
    }
}