请教一个窗口事件处理的问题

[uranuskevin]

请高手指教
这是一个书上的例子，可是在编译（JDK1.4）时，出错：
TestWindow should be declared abstract
it dose not define ...

代码如下
import java.awt.*;
import java.awt.event.*;

public class TestWindow implements WindowListener
{
Frame f;
public static void main(String las[])
{
TestWindow t=new TestWindow();
t.go();

}//main

void go()
{
f=new Frame("Canvas");
f.setSize(150,150);
f.addWindowListener(this);
f.setVisible(true);
}
public void windowClosing(WindowEvent ev)
{ System.out.println("1"); }

public void windowOpened(WindowEvent ev)
{ System.out.println("2"); }

public void windowIconfied(WindowEvent ev)
{ System.out.println("3"); }

public void windowDeiconfied(WindowEvent ev)
{ System.out.println("4"); }

public void windowClosed(WindowEvent ev)
{ System.out.println("5"); }

public void windowActivated(WindowEvent ev)
{ System.out.println("6"); }

public void windowDeactivated(WindowEvent ev)
{ System.out.println("7"); }

}//class

[boyard]

TestWindow should be declared abstract;
it does not define windowIconified(java.awt.event.WindowEvent) in TestWindow

[uranuskevin]

对
我是说怎么改才能编译？

[kally]

定义一个windowIconified(java.awt.event.WindowEvent)方法啊

[wtjd]

不用这么复杂，你怎么不使用适配器类WindowAdapter呢？你继承它的话，就不必为每个动作书写方法体了！