题解 | #判断各类型字符个数#

import java.util.Scanner;
import static java.lang.Character.*;

public class Main {
    public static void main(String[] args) {
        int numbers = 0;
        int words = 0;
        int space = 0;
        int other = 0;
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();

        for (int i = 0; i < str.length(); i++) {
            Character ch =str.charAt(i);
		  //三目运算符
            int n=isLetter(ch)//isLetter()判断是否为字母
            ?words++:isDigit(ch)//isDigit()判断是否为数字
            ?numbers++:(ch==32)//根据ASCII码判断是否为空格
            ?space++:other++;
        }
        System.out.println("英文字母" + words + "数字" + numbers + "空格" +
                           space + "其他" + other);
    }
}