java 实现双色球随机选一注

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java 实现双色球随机选一注

直接上代码

private static String[] 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","33"};public static String[] getShuan() {String[] doubleColorBall=new String[7];boolean[] flag=new boolean[balls.length];//System.out.println(Arrays.toString(flag));Random random=new Random();for (int i = 0;i < doubleColorBall.length-1;i++) {while (true) {int index=random.nextInt(balls.length);if(!flag[index]){doubleColorBall[i]=balls[index];flag[index]=true;break;}}}//先给最后一个元素赋个最大值，避免在排序的时候出现空指针doubleColorBall[doubleColorBall.length-1]=balls[balls.length-1];Arrays.sort(doubleColorBall);doubleColorBall[doubleColorBall.length-1]=balls[random.nextInt(16)];return doubleColorBall;}

个人觉得性能还可以，大家自己试试吧