事件处理程序

package com.wsy.work;

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

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

public class EventProcessing implements ActionListener{
    JFrame jf;
    JButton jb;
    JPanel jp;
    public EventProcessing() 
    {
        jf = new JFrame();
        jb = new JButton("改变背景颜色");
        jp = new JPanel();
        jp.add(jb);
        jp.setBackground(Color.BLUE);
        jf.add(jp);
        jf.setSize(300,300);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
        jf.setLocation(100,200);
        jb.addActionListener(this);
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        jp.setBackground(Color.PINK);
    }
    public static void main(String[] args) {
        new EventProcessing();

    }



}