JOptionPane.showMessageDialog退出按钮

Question

如果我有一个JOptionPane.showMessageDialog，当用户按下红色的x时如何退出程序？

JOptionPane.showMessageDialog(null, "Hello, World!"); 

Answer 1

下面是部分代码应该是有用的：

   JFrame frame = new JFrame(); 
       frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 

       frame.addWindowListener(new WindowAdapter() { 
        public void windowClosing(WindowEvent we) { 
         int result = JOptionPane.showConfirmDialog(null, "Exit?", "Confirm Exit", 
           JOptionPane.OK_CANCEL_OPTION); 
         if (result == JOptionPane.OK_OPTION) 
          System.exit(0); 

        } 
       }); 

您还可以使用JOptionPane.YES_NO_OPTION等