java实例化代码------------------监听事件

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ButtonTest

{

public static void main(String args[])

{

ButtonFrame frame = new ButtonFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

}

class ButtonFrame extends JFrame

{

public ButtonFrame()

{

setTitle("Button Test");

setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

ButtonPanel panel = new ButtonPanel();

add(panel);

}

public static final int DEFAULT_WIDTH = 800;

public static final int DEFAULT_HEIGHT = 500;

}

class ButtonPanel extends JPanel

{

public ButtonPanel()

{

//定义button

JButton yellowButton = new JButton("yellow");

JButton blueButton = new JButton("blue");

JButton redButton = new JButton("red");

//添加button到面板

add(yellowButton);

add(blueButton);

add(redButton);

//创建按钮动作

ColorAction yellowAction = new ColorAction(Color.YELLOW);

ColorAction blueAction = new ColorAction(Color.BLUE);

ColorAction redAction = new ColorAction(Color.RED);

//关联按钮与动作

yellowButton.addActionListener(yellowAction);

blueButton.addActionListener(blueAction);

redButton.addActionListener(redAction);

}

private class ColorAction implements ActionListener

{

public ColorAction(Color c)

{

backgroundColor = c;

}

public void actionPerformed(ActionEvent event)

{

setBackground(backgroundColor);

}

private Color backgroundColor;

}

}