嵌入式的JOptionPane按是/否有没有影响(Pressing Yes/No on embedd

我想添加一个退出确认支票的JFrame，但我想对话是未装饰。我已经想通，我需要使用自定义的JDialog和定制的JOptionPane。

frame.addWindowListener(new java.awt.event.WindowAdapter() {

        @Override
        public void windowClosing(java.awt.event.WindowEvent windowEvent) {
            JDialog dialog = new JDialog();
            dialog.setUndecorated(true);


            JOptionPane pane = new JOptionPane("Are you sure that you want to exit?",
             JOptionPane.QUESTION_MESSAGE,JOptionPane.YES_NO_OPTION);


            dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); //I don't even know if this line does anything


            dialog.setContentPane(pane);
            dialog.pack();
            dialog.setLocationRelativeTo(frame);
            dialog.setVisible(true);

            System.out.println("Next Line"); //this line does not work.

        }
    });

出现的对话框正是我想要的，但点击yes或no什么都不做。对话框不消失，我无法找到一个方法来检查被点击了哪个按钮。 “下一行”从不打印到控制台。

Answer 1:

自身嵌入的JOptionPane是不够的。您需要注册的是和否按钮按下一个回调，并适当地处理它们。这可以通过重写的setValue（）方法来进行

JOptionPane pane = new JOptionPane(
        "Are you sure that you want to exit?",
        JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION) {
     @Override
        public void setValue(Object newValue) {
         if (newValue == Integer.valueOf(JOptionPane.YES_OPTION)) {
             System.out.println("yes");
         } else if ( newValue == Integer.valueOf(JOptionPane.NO_OPTION)) {
             System.out.println("no");

         }
     }
};