/**

     * 从0-max随机选N个数出来

     * **/

     public static int[] GetRandomSequence2(int max,int N)

     {

         int[] sequence = new int[max];

         int[] output = new int[N];

         for (int i = 0; i < max; i++)

         {

             sequence[i] = i;

         }

         Random random = new Random();

         int end = max-1;

         for (int i = 0; i < N; i++)

         {

             int num = random.nextInt(end);

             output[i] = sequence[num];

             sequence[num] = sequence[end];

             end--;

         }

         return output;

     }