java怎样注册监听

//麻烦给看一下 激活组件 谢谢
import java.awt.*;

import java.awt.event.*;

public class a01 implements ActionListener {

public static void main(String[] args)
{

jdm();

}

public static void jdm ()
{

Panel d; //控制组件

Frame f=new Frame("矿质营养诊断系统");
f.setLayout(new GridLayout(4,1,20,20));

d=new Panel();

d.setLayout(new FlowLayout());

Button b1=new Button(" 结果 ");
d.add(b1);

//D1.addActionListener(new Listener());
b1.addActionListener();

Button D2=new Button(" 存盘 ");
d.add(D2);
f.add(d);

f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

f.setLocation(200,100);
f.setSize(800,600);

f.setVisible(true);

}