[求助]怎么实现按钮响应！谢谢大家！

我写的代码于下：

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class Test5 extends Applet implements ActionListener {
Checkbox subject1, subject2, subject3, subject4;
String Str1 = new String("");

public void init() {

Label L1 = new Label("姓名");
Label L2 = new Label("学号");
Label L3 = new Label("性别");
Label L4 = new Label("年龄");
TextField f1=new TextField("",10);
TextField f2=new TextField("",10);
TextField f3=new TextField("",10);
TextField f4=new TextField("",10);
Button Button1 = new Button("添加");
Button Button2 = new Button("删除");
Button Button3 = new Button("修改");
Button Button4 = new Button("查询");

add(L1);
add(f1);
add(L2);
add(f2);
add(L3);
add(f3);
add(L4);
add(f4);
add(Button1);
add(Button2);
add(Button3);
add(Button4);
Button1.addActionListener(this);

}

public void actionPerformed(ActionEvent event) {


repaint();
}
}

----------------解决方案--------------------------------------------------------
actionPerformed中用 getsource获得相应的按钮 然后编写方法
exp:
if(e.getsource==button1){
//要实现的 动作
}
----------------解决方案--------------------------------------------------------