红包随机分配算法

private void split(int sum, int count) {
        //check sum count whether valid
        //.............

        //assgin
        int[] splits = new int[count];
        Random random = new Random();
        int remainsCount = count - 1;
        for (int i=0;i<count-1;i++) {
            splits[i] = random.nextInt(sum - remainsCount)+1;
            sum = sum-splits[i];
            remainsCount--;
        }
        splits[count-1] = sum;
        System.out.println(Arrays.toString(splits));
}