SwingWorker類的，做（）方法​​不叫

Question

這一點，只是SwingWorker類的實現：

class GuiWorker extends SwingWorker<Integer, Integer> { 
    private JFrame frame = new JFrame(); 
    private JDialog dialog = new JDialog(frame, "Loadin data", true); 
    private JProgressBar progressBar = new JProgressBar(); 

    private Statistics st = new Statistics(); 

    public GuiWorker(GraphEditor editor, Statistics st) { 
     this.st = st; 

     Window mainWindow = SwingUtilities.windowForComponent(editor 
       .getGraphComponent().getParent()); 
     dialog.setSize(400, 200); 

     int x = mainWindow.getX() + (mainWindow.getWidth() - dialog.getWidth()) 
       /2; 
     int y = mainWindow.getY() 
       + (mainWindow.getHeight() - dialog.getHeight())/2; 
     progressBar.setString("Have fun to wait some time..."); 
     progressBar.setStringPainted(true); 
     progressBar.setIndeterminate(true); 
     dialog.add(progressBar); 
     dialog.setModal(true); 
     dialog.setLocation(x, y); 
     dialog.setVisible(true); 
    } 

    @Override 
    protected Integer doInBackground() throws Exception { 
     st.loadInitialData(); 
     return 0; 
    } 

    @Override 
    protected void done() { 
     dialog.setVisible(false); 
     JLabel label = new JLabel("Task Complete"); 
     dialog.getContentPane().remove(progressBar); 
     dialog.getContentPane().add(label); 
     dialog.getContentPane().validate(); 
     dialog.setVisible(false); 
    } 
} 

是diaglog從不隱藏，直到我forcely關閉它（當任務完成後，必須被隱藏）的問題。 我注意到loadInitialData()方法是從我的DB收集一些統計信息的方法，它需要幾秒鐘的時間。

UPDATE：我確信只有在關閉dialog時調用了done()方法。

UPDATE： 如果我使用GuiWorker是在這裏：

mainTabs.addChangeListener(new ChangeListener() { 
       @Override 
       public void stateChanged(ChangeEvent e) { 
        switch (mainTabs.getSelectedIndex()) { 
        case 0: 
        case 1: 
        case 2: // stats tab 
         GuiWorker gw = new GuiWorker(editor,st); 
         gw.execute(); 
         break; 
        default: 
         break; 
        } 
       } 
      }); 

Answer 1

所有Swing事件在Event Dispatch Thread內運行。因此，您添加到mainTabs的ChangeListener將在「事件調度線程」中運行。

在事件監聽器中，您實例化了GuiWorker，並在該構造函數中調用dialog.setVisible(true);來打開對話框。

您的JDialog實例是modal並且在模態對話框中調用setVislbe(true)會阻止調用線程，在您的情況下是Event Dispatch Thread。所以直到對話框關閉，gw.execute();不被調用。這就是爲什麼你的done方法沒有被調用，直到你關閉對話框。

爲了您的代碼正常工作，您可以嘗試在構造函數中不要調用setVisible(true)，而是從GuiWorker提供一種方法來設置對話框的可見性。然後致電gw.execute();致電gw.setVisible(true)。

爲了澄清，嘗試

class GuiWorker extends SwingWorker<Integer, Integer> { 
    private JFrame frame = new JFrame(); 
    private JDialog dialog = new JDialog(frame, "Loadin data", true); 
    private JProgressBar progressBar = new JProgressBar(); 

    private Statistics st = new Statistics(); 

    public GuiWorker(GraphEditor editor, Statistics st) { 
     this.st = st; 

     Window mainWindow = SwingUtilities.windowForComponent(editor 
       .getGraphComponent().getParent()); 
     dialog.setSize(400, 200); 

     int x = mainWindow.getX() + (mainWindow.getWidth() - dialog.getWidth()) 
       /2; 
     int y = mainWindow.getY() 
       + (mainWindow.getHeight() - dialog.getHeight())/2; 
     progressBar.setString("Have fun to wait some time..."); 
     progressBar.setStringPainted(true); 
     progressBar.setIndeterminate(true); 
     dialog.add(progressBar); 
     dialog.setModal(true); 
     dialog.setLocation(x, y); 
    } 

    @Override 
    protected Integer doInBackground() throws Exception { 
     st.loadInitialData(); 
     return 0; 
    } 

    @Override 
    protected void done() { 
     dialog.setVisible(false); 
     JLabel label = new JLabel("Task Complete"); 
     dialog.getContentPane().remove(progressBar); 
     dialog.getContentPane().add(label); 
     dialog.getContentPane().validate(); 
     dialog.setVisible(false); 
    } 

    public void setVisible(boolean visible) { 
     dialog.setVisible(visible); 
    } 
} 

和

mainTabs.addChangeListener(new ChangeListener() { 
       @Override 
       public void stateChanged(ChangeEvent e) { 
        switch (mainTabs.getSelectedIndex()) { 
        case 0: 
        case 1: 
        case 2: // stats tab 
         GuiWorker gw = new GuiWorker(editor,st); 
         gw.execute(); 
         gw.setVisible(true); 
         break; 
        default: 
         break; 
        } 
       } 
      });