백준 알고리즘 11720번: 숫자의 합 - JAVA

https://www.acmicpc.net/problem/11720

11720번: 숫자의 합

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = null;
        
        int size = Integer.parseInt(br.readLine());
        int sum = 0;
        
        st = new StringTokenizer(br.readLine());
        
        char [] str = st.nextToken().toCharArray();
        
        for(int i=0; i<str.length; i++) {
            sum+=str[i]-'0';
        }
        bw.write(sum+"\n");
        
        bw.flush();
        bw.close();
    }
}