打印首先出现三次的字符

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给定一个英文字符串,写一段代码找出字符串中首先出现三次的英文字母。 输入描述:输入数据一个
字符串,包括字母,数字 输出描述:输出首先出现三次的那个英文字符 示例: 输入: Have you ever gone shopping
and 输出: e

public static char findRepeatCharNumber(String value){
        if (value == null || value.length()==0){
            throw new UnsupportedOperationException("value must be not null/empty");
        }
        int[] counter = new int[255];
        char[] chars = value.toCharArray();
        for (int i = 0; i <chars.length ; i++) {
            char c = chars[i];
            if (c > 'a'&& c< 'z'|| c > 'A'&& c< 'Z'){
                counter[c]++;
            }
            if (counter[c]==3){
                return c;
            }
        }
        throw new RuntimeException("Not found three times char");

    }

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转载自blog.csdn.net/qq_43765564/article/details/89608349