java-swingButton

package com.http;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import com.http.TestSwing2.HelloWorldFrame;

public class SwingButton extends JFrame
{
    private JPanel buttonPanel;
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 200;
    
    public SwingButton()
    {
        setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
        //创建按钮
        JButton yellowButton = new JButton("yellow");
        JButton blueButton = new JButton("blue");
        JButton redButton = new JButton("red");
        
        buttonPanel = new JPanel();
        
        //向面板中添加按钮
        buttonPanel.add(yellowButton);
        buttonPanel.add(blueButton);
        buttonPanel.add(redButton);
        
        //向frame中添加面板
        add(buttonPanel);
        
        //实例化事件
        ColorAction ya = new ColorAction(Color.YELLOW);
        ColorAction ba = new ColorAction(Color.BLUE);
        ColorAction ra = new ColorAction(Color.RED);
        
        //添加按钮事件，改变面板的颜色
        yellowButton.addActionListener(ya);
        blueButton.addActionListener(ba);
        redButton.addActionListener(ra);
        
    }
    
    //触发后执行的事件，继承ActionListener，并重写actionPerformed接口
    public class ColorAction implements ActionListener
    {

        private Color backgroundColor;
        public  ColorAction(Color c)
        {
             backgroundColor = c;
        }
        
        @Override
        public void actionPerformed(ActionEvent event) {
            // TODO Auto-generated method stub
            buttonPanel.setBackground(backgroundColor);
        }    
    }

    public static void main(String[] argvs)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                
                JFrame frame = new SwingButton();
                frame.setTitle("SwingButton");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
        
    }
    
}