实现彩票摇奖的Applet

import javax.swing.JButton; import javax.swing.JApplet; import javax.swing.JPanel; import javax.swing.BorderFactory; import javax.swing.SwingUtilities; import java.awt.GridLayout; import java.awt.FlowLayout; import java.awt.Dimension; import java.awt.Container; import java.awt.Color; import java.util.Random; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class Lottery extends JApplet { /** Initialization method that will be called after the applet is loaded * into the browser. */ public void init() { // TODO start asynchronous download of heavy resources创建事件线程接口 SwingUtilities.invokeLater ( new Runnable() { public void run() { createGUI(); } } ); } //创建Applet用户接口 public void createGUI() { //建立容器 Container content=getContentPane(); content.setLayout(new GridLayout(0,1));//建立布局 //建立第一个面板及面板边框，面板中装入数字按钮 JPanel buttonPane=new JPanel(); buttonPane.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.cyan,Color.blue),"您的彩票号！")); int[] choices=getNumbers();//得到初始化的一系列数字 for(int i=0;i<numberCount;i++) { luckyNumbers[i]=new Selection(choices[i]); buttonPane.add(luckyNumbers[i]); } content.add(buttonPane); //建立第二个面板，装入控制按钮 JPanel controlPane=new JPanel(new FlowLayout(FlowLayout.CENTER,5,10)); JButton button; Dimension buttonSize=new Dimension(100,20); controlPane.add(button=new JButton("重新买彩票！")); button.setBorder(BorderFactory.createRaisedBevelBorder()); button.addActionListener(new HandleControlButton(PICK_LUCKY_NUMBERS)); button.setPreferredSize(buttonSize); controlPane.add(button=new JButton("选择颜色！")); button.setBorder(BorderFactory.createRaisedBevelBorder()); button.addActionListener(new HandleControlButton(COLOR)); button.setPreferredSize(buttonSize); content.add(controlPane); } //生产随机数 static int[] getNumbers() { int[] numbers=new int[numberCount]; int candidate=0; for(int i=0;i<numberCount;i++) { search: for(;;) { candidate=values[choice.nextInt(values.length)]; for(int j=0;j<i;j++) { if(candidate==numbers[j]) { continue search; } } numbers[i]=candidate; break; } } return numbers; } //定义选择数字按钮的类，每个数字按钮都实现监听器接口 class Selection extends JButton implements ActionListener { //定义结构 public Selection(int value) { super(Integer.toString(value)); this.value=value; setBackground(startColor); setBorder(BorderFactory.createRaisedBevelBorder()); setPreferredSize(new Dimension(80,20)); addActionListener(this); } //处理选择按钮事件 public void actionPerformed(ActionEvent e) { //改变当前按钮的值 int candidate=0; for(;;) { candidate=values[choice.nextInt(values.length)]; if(isCurrentSelection(candidate)) { continue; } setValue(candidate); return; } } public void setValue(int value) { setText(Integer.toString(value)); this.value=value; } boolean hasValue(int possible) { return value==possible; } boolean isCurrentSelection(int possible) { for(int i=0;i<numberCount;i++) { if(luckyNumbers[i].hasValue(possible)) { return true; } } return false; } private int value; } //定义控制按钮的类 class HandleControlButton implements ActionListener { //定义结构 public HandleControlButton(int buttonID) { this.buttonID=buttonID; } //处理按钮的点击 public void actionPerformed(ActionEvent e) { switch(buttonID) { case PICK_LUCKY_NUMBERS: int[] numbers=getNumbers(); for(int i=0;i<numberCount;i++) { luckyNumbers[i].setValue(numbers[i]); } break; case COLOR: Color color=new Color(flipColor.getRGB()^luckyNumbers[0].getBackground().getRGB()); for(int i=0;i<numberCount;i++) luckyNumbers[i].setBackground(color); break; } } private int buttonID; } final static int numberCount=6; final static int minValue=1; final static int maxValue=49; static int[] values=new int[maxValue-minValue+1]; static { for(int i=0;i<values.length;i++) values[i]=i+minValue; } //定义一组选择数字的普通按钮 private Selection[] luckyNumbers = new Selection[numberCount]; final public static int PICK_LUCKY_NUMBERS=1; //选择按钮ID final public static int COLOR=2; //按钮颜色 Color flipColor =new Color(Color.RED.getRGB()^Color.YELLOW.getRGB()); Color startColor=Color.RED; private static Random choice=new Random(); //public void paint(Graphics g) { }