[프로그래머스] 숨어있는 숫자

class Solution {
    public int solution(String my_string) {
        int answer = 0;
        int curr = 0;
        boolean isNumber = false;
        for (int i = 0; i < my_string.length(); i++) {
            char ch = my_string.charAt(i);
            if (Character.isDigit(ch)) {
                curr = curr * 10 + ch - '0';
                isNumber = true;
            } else {
                if (isNumber) {
                    answer += curr;
                    curr = 0;
                    isNumber = false;
                }
            }
        }
        if (isNumber) answer += curr;
        return answer;
    }
}