1 package com.http; 2  3 import java.awt.*; 4 import java.awt.event.*; 5  6 import javax.swing.*; 7  8 import com.http.TestSwing2.HelloWorldFrame; 9 10 public class SwingButton extends JFrame11 {12     private JPanel buttonPanel;13     private static final int DEFAULT_WIDTH = 300;14     private static final int DEFAULT_HEIGHT = 200;15     16     public SwingButton()17     {18         setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);19         //创建按钮20         JButton yellowButton = new JButton("yellow");21         JButton blueButton = new JButton("blue");22         JButton redButton = new JButton("red");23         24         buttonPanel = new JPanel();25         26         //向面板中添加按钮27         buttonPanel.add(yellowButton);28         buttonPanel.add(blueButton);29         buttonPanel.add(redButton);30         31         //向frame中添加面板32         add(buttonPanel);33         34         //实例化事件35         ColorAction ya = new ColorAction(Color.YELLOW);36         ColorAction ba = new ColorAction(Color.BLUE);37         ColorAction ra = new ColorAction(Color.RED);38         39         //添加按钮事件，改变面板的颜色40         yellowButton.addActionListener(ya);41         blueButton.addActionListener(ba);42         redButton.addActionListener(ra);43         44     }45     46     //触发后执行的事件，继承ActionListener，并重写actionPerformed接口47     public class ColorAction implements ActionListener48     {49 50         private Color backgroundColor;51         public  ColorAction(Color c)52         {53              backgroundColor = c;54         }55         56         @Override57         public void actionPerformed(ActionEvent event) {58             // TODO Auto-generated method stub59             buttonPanel.setBackground(backgroundColor);60         }    61     }62 63     public static void main(String[] argvs)64     {65         EventQueue.invokeLater(new Runnable()66         {67             public void run()68             {69                 70                 JFrame frame = new SwingButton();71                 frame.setTitle("SwingButton");72                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);73                 frame.setVisible(true);74             }75         });76         77     }78     79 }