Java 无法将JOptionPane设置为不可见，然后重新设置为可见

我想要达到的是

• 在特定状态下，类应该自动隐藏其他类显示的对话框
• 当程序状态改变时，应显示隐藏对话框

问题:

• 这不适用于JOptionPanes
• JOptionPanes会隐藏并再次显示，但随后会自动关闭，因此我只会在一秒钟内再次看到它们

我采用了以下方法：

public static void main(String[] args) {


    Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {

        public void eventDispatched(AWTEvent event) {
            WindowEvent windowEvent = ((WindowEvent) event);
            System.out.println(System.currentTimeMillis() + " " + windowEvent);
            switch (windowEvent.getID()) {
            case WindowEvent.WINDOW_OPENED:
                System.out.println("Hiding");
                windowEvent.getComponent().setVisible(false);
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Showing");
                windowEvent.getComponent().setVisible(true);
                break;
            }
        }


    }, AWTEvent.WINDOW_EVENT_MASK + AWTEvent.WINDOW_STATE_EVENT_MASK);

    JOptionPane.showMessageDialog(null,
            "Eggs are not supposed to be green.",
            "Inane custom dialog",
            JOptionPane.INFORMATION_MESSAGE);
}

它产生以下输出：

1347602481337 java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] 
on dialog0
1347602481337 java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602481337 java.awt.event.WindowEvent[WINDOW_OPENED,opposite=null,oldState=0,newState=0] on dialog0
Hiding
Showing
1347602486377 java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_DEACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_GAINED_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_LOST_FOCUS,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_DEACTIVATED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on dialog0
1347602486377 java.awt.event.WindowEvent[WINDOW_CLOSED,opposite=null,oldState=0,newState=0] on frame0

---

我的问题是，我做错了什么？这是每个设计还是我犯了错误，我使用类的方式是否错误？如果是，正确的方法是什么？

您所做的错误是在事件调度线程上休眠：

windowEvent.getComponent().setVisible(false);
try {
  Thread.sleep(5000);
} catch (InterruptedException e) {
  e.printStackTrace();
}
System.out.println("Showing");
windowEvent.getComponent().setVisible(true);

通过阻断EDT 5秒钟，无法重新绘制任何内容。改用

计时器

有关详细信息，请参阅本教程。
我在睡眠周围添加了“EventQueue.invokeLater（new Runnable（）…”，对话框的设置再次可见。现在它可以工作了。谢谢。@Flo然后您仍然在EDT上睡眠，这会阻止所有UI操作。从不在EDT上睡眠。我将程序更改为使用Timer.schedule（TimerTask任务，长延迟）相反。因此，这种方法不会阻塞EDT队列，应该在这种情况下使用。我理解正确吗？@Flo我建议使用
javax.swing.Timer
，因为这个
Timer
将在EDT上执行。因此，如果您想在5秒内安排EDT上发生的事情，您确实使用了
定时器，而不是ode>线程睡眠