16.1

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test_16 extends JFrame{

    public Test_16(){
        JP J = new JP();        
        add(J);
    }
    
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Test_16 t1 = new Test_16();
        t1.setTitle("print");
        t1.setSize(200,200);
        t1.setFocusable(true);
        t1.setLocationRelativeTo(null);
        t1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        t1.setVisible(true);        
    }    
    
    static class JP extends JPanel{    
        JButton j1 = new JButton("Button1");
        JButton j2 = new JButton("Button2");
        public JP(){
            add(j1);
            add(j2);
            j1.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent e){
                    System.out.println("j1 is pressed");
                }
            });
            j2.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent e){
                    System.out.println("j2 is pressed");
                }
            });                        
        }        
    }
    
}

效果图：