编译错误，如何解决？

[fengyepiaoling]

java.awt.*;
import java.awt.event.*;
class ft3
{
public static void main(String args [])
{
Frame ftObj=new Frame("第二个窗口程序！");
Button b1=new Button("A");
Button b2=new Button("A");
Button b3=new Button("A");
Button b4=new Button("A");
Button b5=new Button("A");
Button b6=new Button("A");
TextArea t1=new TextArea("不知道",4,20);
ftObj.setLayout(new FlowLayout(FlowLayout.LEFT,50,50));
ftObj.add(b1);
ftObj.add(b2);
ftObj.add(b3);
ftObj.add(b4);
ftObj.add(b5);
ftObj.add(b6);
ftObj.add(t1);
ftObj.addWindowListener(new MyWindowListener());
ftObj.setBounds(100,100,300,250);
ftObj.setVisible(true);
}
}
class MyWindowListener implements WindowListener
{
public void WindowClosing(WindowEvent e)
{
e.getWindow().setVisible(false);
((Window)e.getComponent()).dispose();
System.exit(0);
}
public void WindowOpened(WindowEvent e){}
public void WindowIconified(WindowEvent e){}
public void WindowDeiconified(WindowEvent e){}
public void Windowclosed(WindowEvent e){}
public void WindowActivated(WindowEvent e){}
public void WindowDeactivated(WindowEvent e){}
}
编译的时候总是如下提示：
ft3.java:3: ft3 is not abstract and does not override abstract method windowOpen
ed(java.awt.event.WindowEvent) in java.awt.event.WindowListener
class ft3 implements WindowListener
求解决办法！

[kingfish]

函数名字错误！

如windowClosed ，第一个单词首字母小写，其它单词首字母大写

[ysbcg]

Method Summary
void windowActivated(WindowEvent e)
void windowClosed(WindowEvent e)
void windowClosing(WindowEvent e)
void windowDeactivated(WindowEvent e)
void windowDeiconified(WindowEvent e)
void windowIconified(WindowEvent e)
void windowOpened(WindowEvent e)

[OnlyFor_love]

public void WindowClosing(WindowEvent e)



应该改成public void windowClosing(WindowEvent e)=================注意大小写