import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

  @ expected

     匿名内部类(没有名字的内部类)

      JButton button = new JButton(“button”);

                  button.addActionListener(new ActionListener(){

                         public void actionPerformed(ActionEvent e){

                             System.out.println(“Button Clicked”);

                         }

                  });