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 scanner = new Scanner(System.in);
        while (scanner.hasNext()){
            String s = scanner.nextLine();
            char[] cy = s.toCharArray();
            int letter=0;
            int white=0;
            int num=0;
            int other=0;
            for (int i = 0; i <cy.length; i++) {
                if (Character.isLetter(cy[i])){
                    letter++;
                } else if (Character.isDigit(cy[i])) {
                    num++;
                } else if (Character.isWhitespace(cy[i])) {
                    white++;
                }else {
                    other++;
                }
            }
            System.out.println(letter);
            System.out.println(white);
            System.out.println(num);
            System.out.println(other);
        }
    }
}