第一个只出现一次的字符_34

   public int FirstNotRepeatingChar_m1(String str) {
        HashMap<Character,Integer> charCount=new HashMap<>();
        for (int i = 0; i < str.length(); i++) {
            charCount.put(str.charAt(i),charCount.get(str.charAt(i))==null?1:(charCount.get(str.charAt(i))+1));
        }

        for (int i = 0; i < str.length(); i++) {
            if (charCount.get(str.charAt(i))==1){
                return i;
            }
        }

        return -1;
    }

public int FirstNotRepeatingChar(String str) {
        int[] charCount=new int[58];
        for (int i = 0; i < str.length(); i++) {
            charCount[str.charAt(i)-'A']++;
        }


        for (int i = 0; i < str.length(); i++) {
            if (charCount[str.charAt(i)-'A']==1){
                return i;
            }
        }

        return -1;
    }