Next Biggest Number

    public static long nextBiggerNumber(long n)
    {
      String[] sDigits = String.valueOf(n).split("");
      if (sDigits.length == 1) return -1;

      int[] digits = new int[sDigits.length];

      for (int i = 0; i < digits.length; i++){
          digits[i] = Integer.valueOf(sDigits[i]);
      }

      boolean swap = false;
      int index = 0;

      for (int i = digits.length-2; i >=0; i--){
          if (swap) break;
          for (int j = digits.length-1; j > i; j--){
              if (digits[i] < digits[j]){
                  int temp = digits[i];
                  digits[i] = digits[j];
                  digits[j] = temp;
                  swap = true;
                  index = i;
                  break;
              }
          }
      }

      if (!swap) return -1;

      for (int i = index+1; i < digits.length-1; i++){
          for (int j = i+1; j < digits.length; j++){
              if (digits[i] > digits[j]){
                  int temp = digits[i];
                  digits[i] = digits[j];
                  digits[j] = temp;
                  i = index;
                  break;
              }
          }
      }

      StringBuffer sb = new StringBuffer("");

      for (Integer i : digits){
          sb.append(String.valueOf(i));
      }

      return Long.valueOf(sb.toString());
    }