芭比公主大电影之全集:java的问题

import java.applet.*; import java.awt.*; import java.awt.event.*;
class Mypanel extends Panel implements ActionListener
{Button button1,button2,button3;
Color backColor;
Mypanel()
{button1=new Button("确定");button2=new Button("取消");button3=new Button("保存");
add(button1);
add(button2);
add(button3);
setBackground(Color.pink);
backColor=getBackground();
button1.addActionListener(this);button2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==button1)
{setBackground(Color.cyan);
}
else if(e.getSource()==button2)
{setBackground(backColor);
}
}
}
public class e111 extends Applet
{Mypanel panel1,panel2,panel3;
Button button6;
public void init()
{panel1=new Mypanel();
panel2=new Mypanel();
panel3=new Mypanel();
button6=new Button("不在这些面板里");
add(panel1);
add(panel2);
add(panel3);
add(button6);
button6.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==button6)
{setBackground(Color.red);
}
}
}
E:\java edit>javac e111.java
e111.java:35: 无法将 java.awt.Button 中的 addActionListener(java.awt.event.ActionListener) 应用于 (e111)
button6.addActionListener(this);
^
1 错误
求救高手~~~~~