我有一个带有线程的 JDialog。创建对话框时,它偶尔会给我一个 ClassCastException (这意味着我可以毫无例外地成功),而且我不知道它应该在哪里发生。
这是我的 JDialog 类的片段
public class ConfirmExitDialog extends JDialog implements Runnable,
ActionListener {
private static final long serialVersionUID = -8762051370686039110L;
private Thread dialogThread;
private boolean running;
private int result, count = 60;
private HandleExit handleExit = null;
// GUI
private JOptionPane optionPane;
private JLabel msgLabel = new JLabel();
private JButton btnYes;
private JButton btnNo;
private void updateLabelText() {
msgLabel.setText("<html>Ønsker du at afslutte dagens salg?<br>Programmet afslutter automatisk om " + count + " sekunder.</html>");
}
public int getResult() {
return result;
}
public ConfirmExitDialog(Frame frame, HandleExit handleExit) {
super(frame, false);
this.handleExit = handleExit;
setTitle("Afslut dagens salg?");
display();
running = true;
if (dialogThread == null) {
dialogThread = new Thread(this, "ConfirmExitDialog");
dialogThread.start();
}
this.setModal(true);
}
public void close() {
if (dialogThread != null)
running = false;
}
private void display() {
setLayout(new BorderLayout());
// Buttons
btnYes = new JButton("Ja");
btnYes.addActionListener(this);
btnYes.setMnemonic('J');
add(btnYes, BorderLayout.WEST);
btnNo = new JButton("Nej");
btnNo.addActionListener(this);
btnNo.setMnemonic('N');
add(btnNo, BorderLayout.EAST);
JButton[] buttons = { btnYes, btnNo };
updateLabelText();
optionPane = new JOptionPane(msgLabel, JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION, null, buttons, buttons[0]);
setContentPane(optionPane);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// Handle window closing correctly.
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
/*
* Instead of directly closing the window, we're going to change the
* JOptionPane's value property.
*/
optionPane.setValue(new Integer(JOptionPane.CLOSED_OPTION));
}
});
pack();
setVisible(true);
}
private void countDown() {
updateLabelText();
count--;
}
@Override
public void run() {
// TODO Auto-generated method stub
try {
display();
while (running && count > 0) {
System.out.println("Countdown " + count);
pack();
countDown();
Thread.sleep(1000);
}
setVisible(false);
if (count == 0)
handleExit.closeApplication(true, true);
} catch (InterruptedException ie) {
// Thread stopped
}
}
@Override
public void actionPerformed(ActionEvent event) {
Object src = event.getSource();
if (src == btnYes) {
setVisible(false);
result = JOptionPane.YES_OPTION;
running = false;
handleExit.closeApplication(true, false);
}
if (src == btnNo) {
setVisible(false);
result = JOptionPane.NO_OPTION;
running = false;
}
}
}
这是异常演员表:
java.util.Arrays.mergeSort(Arrays.java:1293) 的 java.util.Arrays.mergeSort(Arrays.java:1293) 的 javax.swing.LayoutComparator.compare(LayoutComparator.java:61) 的线程“AWT-EventQueue-0”java.lang.ClassCastException 中的异常。 Arrays.mergeSort(Arrays.java:1282) at java.util.Arrays.sort(Arrays.java:1210) at java.util.Collections.sort(Collections.java:159) at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy .java:119) 在 javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:434) 在 javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:148) 在 javax.swing.SortingFocusTraversalPolicy.getDefaultPolicy(SortingFocusTraversalPolicy.java:511).在 java.awt.FocusTraversalPolicy。getInitialComponent(FocusTraversalPolicy.java:152) 在 java.awt.Window.getMostRecentFocusOwner(Window.java:2131) 在 java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:629) 在 java.awt.Component.dispatchEventImpl(Component.java :4502) 在 java.awt.Container.dispatchEventImpl(Container.java:2099) 在 java.awt.Window.dispatchEventImpl(Window.java:2478) 在 java.awt.Component.dispatchEvent(Component.java:4460) 在 java .awt.EventQueue.dispatchEvent(EventQueue.java:599) 在 java.awt.SequencedEvent.dispatch(SequencedEvent.java:101) 在 java.awt.EventQueue.dispatchEvent(EventQueue.java:597) 在 java.awt.EventDispatchThread。 pumpOneEventForFilters(EventDispatchThread.java:269) 在 java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 在 java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) 在 java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) 在 java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) 在 java. awt.EventDispatchThread.run(EventDispatchThread.java:122)
谢谢你。丹尼尔