JFrame关闭按钮的弹出窗口 [英] Popup for JFrame close button

问题描述

我正在做一些基本的Java Swing application(初学者级别). 我要做的是当我按下close button on JFrame来结束窗口时，我想要的是JOptionPane Confirm Dialog而不是直接关闭

i am doing some basic Java Swing application (beginner level) . what i have to do is when i press close button on JFrame to colse the window i want a JOptionPane Confirm Dialog instead of straightforward close

这是代码JFrame

here is the code JFrame

   JFrame  frame= new JFrame("frame"); 
   frame.setSize(300,300);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setVisible(true);
   frame.pack();

和JOptionPane代码像这样

and JOptionPane code goes like this

   final JOptionPane optionPane = new JOptionPane("Are You sure?",JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION);

因此，当按下JFrame上的关闭"按钮时，应该弹出此弹出窗口，而不是直接关闭
请指导我我该怎么做..预先感谢

so when Close button on JFrame pressed this popup should come up instead of Direct closing
Please guide me how i can do it .. Thanks in advance

推荐答案

您可以按照以下步骤操作:

You can do it by following steps:

1. 将frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);行替换为frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

实施WindowListener并覆盖其所有抽象方法.您可以在此处查找.

Implement WindowListener and override its all abstract methods. You can find it here.

以这种方式覆盖public void windowClosing(WindowEvent e)方法:

 @Override
 public void windowClosing(WindowEvent e){
       int result = JOptionPane.showConfirmDialog(null, "Are you sure,"Confirm",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);

       if(result == JOptionPane.YES_OPTION){
               System.exit(0);
       }else{
               //Do nothing
       }
 }

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