大哥大姐谢谢了，我是新手

编译时出这个错'class'or'interface'expected
程序如下：
import java.awt.*;
import java.awt.event.*;
public class TestFrame
{
public static void main(String [] args)
{
Frame f=new Frame("Íõ²©");
f.add(new Button("OK"));
f.setSize(300,300); 
f.setVisible(true);
f.addWindowListener(new MyWindowListener());
}
}
class MyWindowListener implements WindowListener
{
public void windowClosing(WindowEvent e)
{
e.getWindow().setVisible(false);
((Window)e.getComponent()).dispose();
System.exit(0);
}
public void windowActivated(windowEvent e){}
public void windowClosed(windowEvent e){}
public void windowDeactivated(windowEvent e){}
public void windowDeiconified(windowEvent e){}
public void windowIconified(windowEvent e){}
public void windowOpened(windowEvent e){}
}
}