java编写双色球源代码。-----系统作为彩票双色球生成器，模拟机选一注双色球的彩票号码

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package demo2; import java.util.Arrays; import java.util.Random; /**  * 系统作为彩票双色球生成器，模拟机选一注双色球的彩票号码：  *  1、需要从“01”到“32”中随机选择出6个数字作为红色球且这6个数字不能重复；  *  2、并从”01”到”07”中随机选择一个数字作为蓝色球；  *  3、7个数字合到一起作为一注双色球彩票的号码；  */ public class DoubleBall {     public static void main(String[] args) {         String[] RED_BALLS = { "01", "02", "03", "04", "05", "06", "07", "08",                 "09", "10", "11", "12", "13", "14", "15", "16", "17", "18",                 "19", "20", "21", "22", "23", "24", "25", "26", "27", "28",                 "29", "30", "31", "32" };         String[] BLUE_BALLS = { "01", "02", "03", "04", "05", "06", "07" };         boolean[] redFlags = new boolean[RED_BALLS.length];         String[] redBalls = new String[6];         String blueBall;         Random ran = new Random();         // red         for (int i = 0; i < redBalls.length; i++) {             int index;             do {                 index = ran.nextInt(RED_BALLS.length);             } while (redFlags[index]);             /**              * redFlags[index]用途：              *  当redFlags[index]=true表示已经重复，所以你需要              *  再执行do当中的代码重新获取index              */             redBalls[i] = RED_BALLS[index];             redFlags[index] = true;         }         // blue         blueBall = BLUE_BALLS[ran.nextInt(BLUE_BALLS.length)];         Arrays.sort(redBalls);         System.out.println("**********本期开奖**********");         System.out.println("红球: ");         for (int i = 0; i < redBalls.length; i++) {             System.out.print("(" + redBalls[i] + ") ");         }         System.out.println();         System.out.println("篮球: ");         System.out.print("(" + blueBall + ") ");     } }