public class Main {
    public String solution(int n) {
        String answer = "";
        return answer;
    }

    public static void main(String[] args) {
        Main method = new Main();
        System.out.println(method.solution(718253));
    }
}

해결법

방법 1

public class test01 {
    public String solution(int n) {
        String answer = "";

        int sum = 0;

        while (n > 0) {
            sum += n % 10;
            n /= 10;
        }

        answer = Integer.toString(sum);		// int -> String

        return answer;
    }

    public static void main(String[] args) {
        test01 method = new test01();
        System.out.println(method.solution(718253));
    }
}

• 참고: 자릿수 더하기 Lv. 0