为 setDefaultCloseOperation 创建自定义操作？

发布于 2024-11-08 17:44:15 字数 113 浏览 0 评论 0原文

我想让我的 Java 应用程序在按下“关闭”十字按钮时调用我自己的自定义函数。据我所知，可能没有办法，因为 setDefaultCloseOperation 根本没有重载。

知道如何实现这一点吗？

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半衬遮猫 2024-11-15 17:44:15

也许是这个，但在此之前请阅读 Howard 发布的教程 WindowListener ，有一些/其他选项

WindowListener exitListener = new WindowAdapter() {

    @Override
    public void windowClosing(WindowEvent e) {
        int confirm = JOptionPane.showOptionDialog(
             null, "Are You Sure to Close Application?", 
             "Exit Confirmation", JOptionPane.YES_NO_OPTION, 
             JOptionPane.QUESTION_MESSAGE, null, null, null);
        if (confirm == 0) {
           System.exit(0);
        }
    }
};
frame.addWindowListener(exitListener);

maybe this one, but before that read tutorial WindowListener posted by Howard, there are some/another options

WindowListener exitListener = new WindowAdapter() {

    @Override
    public void windowClosing(WindowEvent e) {
        int confirm = JOptionPane.showOptionDialog(
             null, "Are You Sure to Close Application?", 
             "Exit Confirmation", JOptionPane.YES_NO_OPTION, 
             JOptionPane.QUESTION_MESSAGE, null, null, null);
        if (confirm == 0) {
           System.exit(0);
        }
    }
};
frame.addWindowListener(exitListener);

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从﹋此江山别 2024-11-15 17:44:15

上述所有建议都是正确的，因为您需要使用 WindowListener。

然而，所有答案也不完整，因为他们忘记提及您可能还想添加：

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(...);

这将允许您的代码完全控制窗口关闭过程，因为窗口不会自动关闭，除非您告诉它（通常通过在框架上使用 dispose() 方法）。这允许您提示用户确认是否关闭窗口。

关闭应用程序有一个简单的 API，允许您创建关闭窗口时执行的简单操作。它为您管理关闭操作和窗口侦听器代码。

All the above suggestions are correct in that you need to use a WindowListener.

However all the answer are also incomplete in that they forget to mention that you may also want to add:

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(...);

This will allow your code to take full control of the window closing process as the window will not automatically close unless you tell it to (generally by using the dispose() method on the frame). This allow you to promt the user for a confirmation to close the window or not.

Closing an Application has a simple API that allows you to create a simple Action that is executed when the window is closed. It manages the close operation and the window listener code for you.

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黑凤梨 2024-11-15 17:44:15

您可以为框架添加窗口侦听器：

frame.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent evt) {
     onExit();
   }
  });

...
public void onExit() {
  System.err.println("Exit");
  System.exit(0);
}

You can add a window listener for the frame:

frame.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent evt) {
     onExit();
   }
  });

...
public void onExit() {
  System.err.println("Exit");
  System.exit(0);
}

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