JProgressBar不更新，找不到线索

我将使用PropertyChangeListener来使退火进度值成为类的“绑定”属性。如果需要，任何观察者都不能遵循此属性。例如：

import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import javax.swing.*;import javax.swing.event.SwingPropertyChangeSupport;@SuppressWarnings("serial")public class TspGui2 extends JPanel {   private static final String ANNEALING_PROGRESS = "Annealing Progress";   private JProgressBar progBar = new JProgressBar(0, 100);   private JLabel valueLabel = new JLabel();   private JButton beginAnnealingBtn = new JButton("Begin Annealing");   private MyAnnealing myAnnealing = new MyAnnealing(this);   public TspGui2() {      beginAnnealingBtn.addActionListener(new ActionListener() {         @Override         public void actionPerformed(ActionEvent e) { beginAnnealing();         }      });      myAnnealing.addPropertyChangeListener(new PropertyChangeListener() {         @Override         public void propertyChange(PropertyChangeEvent evt) { if (evt.getPropertyName().equals(MyAnnealing.ANNEALING)) {    // be sure this is done on the EDT    SwingUtilities.invokeLater(new Runnable() {       public void run() {          int annealedValue = myAnnealing.getAnnealedValue();          setValue(annealedValue);          if (annealedValue >= MyAnnealing.MAX_ANNEALED_VALUE) {  beginAnnealingBtn.setEnabled(true);          }       }    }); }         }      });      progBar.setString(ANNEALING_PROGRESS);      progBar.setStringPainted(true);      JPanel northPanel = new JPanel(new GridLayout(1, 0));      northPanel.add(beginAnnealingBtn);      northPanel.add(valueLabel);      setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));      add(northPanel);      add(progBar);   }   public void setValue(int value) {      valueLabel.setText("Value:" + value);      progBar.setValue(value);   }   public void beginAnnealing() {      beginAnnealingBtn.setEnabled(false);      setValue(0);      myAnnealing.reset();      new Thread(new Runnable() {         public void run() { myAnnealing.beginAnnealing();         }      }).start();   }   private static void createAndShowGui() {      TspGui2 mainPanel = new TspGui2();      Jframe frame = new Jframe("TspGui2");      frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);      frame.getContentPane().add(mainPanel);      frame.pack();      frame.setLocationByPlatform(true);      frame.setVisible(true);   }   public static void main(String[] args) {      SwingUtilities.invokeLater(new Runnable() {         public void run() { createAndShowGui();         }      });   }}class MyAnnealing {   public static final String ANNEALING = "Annealing";   public  static final int MAX_ANNEALED_VALUE = 100;   private SwingPropertyChangeSupport propChangeSupport =          new SwingPropertyChangeSupport(this);   private TspGui2 gui;   private int annealedValue;   public MyAnnealing(TspGui2 gui) {      this.gui = gui;   }   public void addPropertyChangeListener(         PropertyChangeListener listener) {      propChangeSupport.addPropertyChangeListener(listener);   }   public void removePropertyChangeListener(         PropertyChangeListener listener) {      propChangeSupport.removePropertyChangeListener(listener);   }   public void reset() {      setAnnealedValue(0);   }   // simulate some long process...   public void beginAnnealing() {      long sleepDelay = 100;      while (annealedValue < MAX_ANNEALED_VALUE) {         setAnnealedValue(annealedValue + 1);         try { Thread.sleep(sleepDelay);         } catch (InterruptedException e) { e.printStackTrace();         }      }   }   public int getAnnealedValue() {      return annealedValue;   }   private void setAnnealedValue(int value) {      final int oldValue = this.annealedValue;      this.annealedValue = value;      propChangeSupport.firePropertyChange(ANNEALING, oldValue, annealedValue);   }   }