1796. 字符串中第二大的数字

1796. 字符串中第二大的数字

      class Solution {
          public int secondHighest(String s) {
              List<Integer> list = new ArrayList<>();
              for (char c : s.toCharArray()) {
                if (c >= '0' && c <= '9')
                    list.add(c - '0');
              }
              if (list.size() <= 1)
                  return -1;
              int[] nums = new int[list.size()];
              for (int i = 0; i < list.size(); i++) {
                  nums[i] = list.get(i);
              }
              Arrays.sort(nums);
              if (nums[0] == nums[nums.length - 1])
                  return -1;
              for (int i = nums.length - 2; i >= 0; i--) {
                  if (nums[i] != nums[i + 1])
                      return nums[i];
              }
              return -1;
          }
      }