生成m个不重复随机数组

    /**
     * 生成m个不重复随机数组
     * @param limit 若为10 则产生 0~9之间的随机数
     * @param need m个
     * @return 随机数组
     */
    private static int[] getRandomMethod(int limit, int need)
    {
        int[] tempArray = new int[limit];
        int[] resArray = new int[need];
        for (int i = 0; i < limit; i++)
        {
            tempArray[i] = i;
        }
        int w = 0;
        Random rand = new Random();

        for (int i = 0; i < need; i++)
        {
            w = rand.nextInt(limit - i) + i;
            int t = tempArray[i];
            tempArray[i] = tempArray[w];
            tempArray[w] = t;
            resArray[i] = tempArray[i];
        }
        return resArray;
    }