哪位高手帮小弟我看下这个程序，说小弟我没重写方法，但是小弟我确实是API复制的啊

import java.awt.*;import java.awt.event.*;public class ActionEvent{    public static void main(String[] args){        Frame f = new Frame("xiaohua");        Button b = new Button();        Monitor m = new Monitor();        b.addActionListener(m);        f.pack();        f.setVisible(true);        }    }    class Monitor implements ActionListener{    void actionPerformed(ActionEvent e) {  //actionPerformed(ActionEvent)        System.out.println("cool boy");        }    }

class Monitor implements ActionListener{    public void actionPerformed(java.awt.event.ActionEvent e) {         System.out.println("cool boy");        }    }