题解 | #统计字符#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int y = 0, k = 0, shu = 0, el = 0;
        while (sc.hasNext()) {
            String s = sc.nextLine();
            for (int i = 0; i < s.length(); i++) {
                char c = s.charAt(i);
                if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z') {
                    y++;
                } else if (c >= '0' && c <= '9') {
                    shu++;
                } else if (c == ' ') {
                    k++;
                } else {
                    el++;
                }
            }
            System.out.println(y);
            System.out.println(k);
            System.out.println(shu);
            System.out.println(el);
        }
    }
}