Java jFrame 关闭按钮

Question

您好，我有一个 jFrame，我想问问用户他是否确定在单击关闭按钮时关闭 jframe:

    this.addWindowListener(new java.awt.event.WindowAdapter() {
    @Override
    public void windowClosing(java.awt.event.WindowEvent windowEvent) {
    Main ma = new Main();

    Object[] options = {"Yes", "NO"};

    int selectedOption = JOptionPane.showOptionDialog(ma, "Are you sure you want to close the system?", "Warning",
    JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,
    null, options, options[0]);

           if (selectedOption == JOptionPane.YES_OPTION) {
               System.exit(0);
           }

    else
    {
    }

    }
    }); 

当他从 jpanel 弹出窗口中选择“否”按钮时，我该如何撤消关闭操作？

Answer 1

首先，您需要将 JFrame 的默认关闭操作设置为在关闭时不执行任何操作:

myJFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

然后按下关闭按钮将不会关闭 JFrame，您将不得不在代码中处理它。