package com.law;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
public class JButtonTest extends JFrame
{
    public JButtonTest()
    {
        setTitle("JButton组件");
        Container container=getContentPane();
        container.setLayout(new GridLayout(3,2,5,5));
        JButton jb1=new JButton("按钮");
        jb1.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JOptionPane.showMessageDialog(null,"弹出对话框");
            }
        });
        container.add(jb1);
        setBounds(100,100,300,300);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args)
    {
        new JButtonTest();
    }
}
程序中监听按钮单击事件，老报如下错误，明明是用的匿名类啊，为什么报错？求解。谢谢
The method addActionListener(ActionListener) in the type AbstractButton is not applicable for the arguments (new ActionListener(){})
    ActionListener cannot be resolved to a type