按钮事件监听

[java]代码库

/**
 * 功能：按钮事件监听
 */
package com.test;
import java.awt.*;

import javax.swing.*;

import java.awt.event.*;
public class Test2 extends JFrame implements ActionListener{

	JPanel jP=null;
	JButton jb1=null;
	JButton jb2=null;
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Test2 test2=new Test2();

	}
	
	public Test2(){
		jP=new JPanel();
		jb1=new JButton("黑色");
		jb2=new JButton("红色");
		
		
		this.add(jb1,BorderLayout.NORTH);
		this.add(jb2,BorderLayout.SOUTH);
		jP.setBackground(Color.black);
		this.add(jP);
		
		//注册监听
		jb1.addActionListener(this);
		jb2.addActionListener(this);
		//指定action命令
		jb1.setActionCommand("黑色");
		jb2.setActionCommand("红色");
		
		this.setSize(300, 200);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
		
	}

	@Override
	//事件处理方法
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		//判断是那个按钮
		if(e.getActionCommand().equals("黑色")){
			jP.setBackground(Color.black);
		}else if(e.getActionCommand().equals("红色")){
			jP.setBackground(Color.red);
		}
		
	}

}