事件处理基础 处理按钮点击事件实例 Java核心技术

package com.sunnyykn.chapter08;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);}}//A frame with a button panelclass ButtonFrame extends JFrame{public static final int DEFAULT_WIDTH = 300;public static final int DEFAULT_HEIGHT = 200;public ButtonFrame(){setTitle("ButtonTest Sunnyykn");setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);//add panel to frameButtonPanel panel = new ButtonPanel();add(panel);}}//A panel with three buttonsclass ButtonPanel extends JPanel{public ButtonPanel(){//create buttonsJButton yellowButton = new JButton("Yellow");JButton blueButton = new JButton("Blue");JButton redButton = new JButton("Red");//add buttons to paneladd(yellowButton);add(blueButton);add(redButton);//create button actionsColorAction yellowAction = new ColorAction(Color.YELLOW);ColorAction blueAction = new ColorAction(Color.BLUE);ColorAction redAction = new ColorAction(Color.RED);//associate actions with buttonsyellowButton.addActionListener(yellowAction);blueButton.addActionListener(blueAction);redButton.addActionListener(redAction);}//an action listener that sets the panel's background colorprivate class ColorAction implements ActionListener{public ColorAction(Color c){backgroundColor = c;}public void actionPerformed(ActionEvent event){setBackground(backgroundColor);}private Color backgroundColor;}}