Java GUI之JDialog

public class DialogDemo implements ActionListener {
   private JButton logOn, register, help, exit;
   private JLabel label;
   private JPanel p;
   private JDialog d1, d2;
   private JTextField t;
   private JPasswordField ps;

   public DialogDemo() {
      JFrame frame = new JFrame("註冊窗口");
      logOn = new JButton("登陸");
      register = new JButton("註冊");
      help = new JButton("幫助");
      exit = new JButton("退出");
      logOn.addActionListener(this);
      exit.addActionListener(this);
      p = new JPanel();
      p.setLayout(new GridLayout(1, 4));
      p.add(logOn);
      p.add(register);
      p.add(help);
      p.add(exit);
      frame.add(p, "North");
      label = new JLabel("您尚未登陸");
      d1 = this.creatLoginDialog(frame);
      d2 = this.creatQuitDialog(frame);
      frame.add(label, "Center");
      frame.setBounds(300, 300, 400, 150);
      frame.setVisible(true);
   }

   public JDialog creatLoginDialog(JFrame f) {
      JDialog d = new JDialog(f, "登陸對話框", true);
      JLabel l = new JLabel("請輸入註冊信息");
      JPanel pa = new JPanel();
      pa.setLayout(new GridLayout(2, 1));
      pa.add(new JLabel("用戶名:"));
      pa.add(new JLabel("密碼:"));
      JPanel pc = new JPanel();
      pc.setLayout(new GridLayout(2, 1));
      t = new JTextField();
      ps = new JPasswordField();
      ps.setEchoChar('*');
      pc.add(t);
      pc.add(ps);
      JPanel pb = new JPanel();
      pb.setLayout(new GridLayout(1, 2));
      JButton b1 = new JButton("提交");
      JButton b2 = new JButton("取消");
      b1.setActionCommand("submitLogin");
      b2.setActionCommand("cancelLogin");
      b1.addActionListener(this);
      b2.addActionListener(this);
      pb.add(b1);
      pb.add(b2);
      d.add(l, "North");
      d.add(pa, "West");
      d.add(pc, "Center");
      d.add(pb, "South");
      d.setSize(180, 120);
      d.setLocation(400, 200);
      return d;
   }

   public JDialog creatQuitDialog(JFrame f) {
      JDialog d = new JDialog(f, "退出對話框", true);
      JLabel l = new JLabel("你確定要退出程序嗎？");
      JPanel p = new JPanel();
      JButton confirm = new JButton("確定");
      JButton cancel = new JButton("取消");
      confirm.setActionCommand("confirmQuit");
      cancel.setActionCommand("cancelQuit");
      confirm.addActionListener(this);
      cancel.addActionListener(this);
      p.add(confirm);
      p.add(cancel);
      d.setSize(160, 120);
      d.setLocation(400, 200);
      d.add(l, "Center");
      d.add(p, "South");
      return d;
   }

   public void actionPerformed(ActionEvent e) {
      String s = e.getActionCommand();
      if (s.equals("登陸")) {
         d1.setVisible(true);
      } else if (s.equals("退出")) {
         this.quit();
      } else if (s.equals("confirmQuit")) {
         System.exit(0);
      } else if (s.equals("cancelQuit")) {
         d2.setVisible(false);
      } else if (s.equals("submitLogin")) {
         String name = t.getText();
         @SuppressWarnings("deprecation")
         String password = ps.getText();
         if (name.equals("Corejava") && password.equals("Tiger")) {
            label.setText("歡迎您:" + name + "用戶");
         } else {
            label.setText("驗證失敗，錯誤的用戶名/密碼!");
            d2.setVisible(false);
         }
      } else if (s.equals("cancelLogin")) {
         d1.setVisible(false);
      }
   }

   public void quit() {
      d2.setVisible(true);
   }

   public static void main(String[] args) {
      new DialogDemo();
   }
}