[BOJ] 10820 문자열 분석 (JAVA)

https://www.acmicpc.net/problem/10820

10820번: 문자열 분석

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringBuilder sb = new StringBuilder();
    static StringTokenizer st;

    public static void main(String[] args) throws Exception {

        while (true) {

            String s = br.readLine();

            if (s == null || s.isEmpty()) break;

            char[] input = s.toCharArray();
            int small = 0;
            int big = 0;
            int number = 0;
            int space = 0;

            for (int i = 0; i < input.length; i++) {
                char c = input[i];
                if ('a' <= c && c <= 'z') small++;
                else if ('A' <= c && c <= 'Z') big++;
                else if (c == ' ') space++;
                else number++;
            }

            sb.append(small + " " + big + " " + number + " " + space + "\n");

        }

        System.out.print(sb.toString());

    }

}