java awt 事件监听 简单示例2

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TestActionEvent2 {

public static void main(String[] args) {
Frame f = new Frame();
Button b1 = new Button("start");
Button b2 = new Button("stop");
Monitor2 mo = new Monitor2();
b1.addActionListener(mo);
b2.addActionListener(mo);
b2.setActionCommand("game over");
f.add(b1, BorderLayout.NORTH);
f.add(b2, BorderLayout.CENTER);
f.pack();
f.setVisible(true);
}

}

class Monitor2 implements ActionListener {

@Override
public void actionPerformed(ActionEvent e) {
System.out.println("a button has been pressed,"
+ "the relative info is:\n" + e.getActionCommand());
}

}