숨어있는 숫자의 덧셈(1)

class Solution { public int solution(String my_string) { int answer = 0; for (int i = 0; i < my_string.length(); i++) { if (my_string.charAt(i) >= '1' && my_string.charAt(i) <= '9') { answer += Integer.parseInt(String.valueOf(my_string.charAt(i))); } } return answer; } }