Sum of all digits for a given Positive Number [closed]

Answer 1

just a different approach, may not be as efficient due to involved conversions:

private static int getUltimateSum(int input) {
    String inputStr = String.valueOf(input);
    int sum = 0;
    for (int i = 0; i < inputStr.length(); i++) {
        int digit = Integer.valueOf(String.valueOf(inputStr.charAt(i)));
        sum += digit;
    }
    if(sum > 9)
        return getUltimateSum(sum);
    else
        return sum;
}