JAVA 编译问题，请教！！！

Question

编译提示只要在javac后加个参数 -d 就可以了要能关掉窗口，需要在构造函数中加入以下代码
       addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent we)
                {
                    System.exit(0);
                }
        });
即：
   public GUITest()
   {
     super("Test GUI");
     setLayout(new BorderLayout());
     add("South",new Button ("确定"));
     pack();
     resize(height,width);
       addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent we)
                {
                    System.exit(0);
                }
        });
     show();
    }

Answer 1

class GUITest extends Frame
应该改为
class GUITest extends JFrame你试试吧

Answer 2

import javax.swing.*;
....setDefaultCloseOperation(EXIT_ON_CLOSE);