新手提问.关于窗口操作.

import java.awt.*;
import java.awt.event.*;
class MyFrame extends Frame implements WindowListener
{
    TextArea text;
    MyFrame(String s)
    {
        super(s);
        setBounds(100,100,100,100);
        setVisible(true);
        text=new TextArea();
        add(text,BorderLayout.CENTER);
            addWindowListener(this);
            validate();
    }
    public void windowActivated(WindowEvent e)
    {
        text.append("\n 我被激活");
        validate();
    }
    public void windowDeactivated(WindowEvent w)
    {
        text.append("\n 我不是激活状态");
            setBounds(0,0,400,400);
            validate();
            
    }
    public void windowClosing(WindowEvent e)
    {
        text.append("\n 窗口正在关闭");
            dispose();
    }
    public void windowClosed(WindowEvent e)
    {
        System.out.println ("窗口关闭");
        System.exit(0);
    }
     public void windowIconified (WindowEvent e)
    {
        text.append("\n 我图表化了");
        
    }
    public void windowDeiconified (WindowEvent e)
    {
        text.append("\n 我取消图表化了");
            setBounds(0,0,400,400);
            validate();
        
    }
}
   
    class Example
    {
        public static void main(String[] args) {
        
        new MyFrame("window");
    }
    }


我完全按书上键入这些东西,但却有错误
MyFrame is not abstract and does not override abstract method windowOpened(java.awt.event.WindowEvent) in java.awt.event.WindowListener

然后窗口操作是操作右上角的那几个小图标么?
class MyFrame extends Frame implements WindowListener
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我完全按书上键入这些东西,但却有错误
MyFrame is not abstract and does not override abstract method windowOpened(java.awt.event.WindowEvent) in java.awt.event.WindowListener

这不是说了吗，没有重载windowOpened函数。
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哦！！发现了！！谢谢了
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