Java判断单个字符类型的几个函数

Character.方法

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner cin=new Scanner(System.in);
        String s=cin.nextLine();
        char ch=s.charAt(0);
        if(Character.isDigit(ch))
            System.out.println("digit");
        else if(Character.isLowerCase(ch))
            System.out.println("lower");
        else if(Character.isUpperCase(ch))
            System.out.println("upper");
        else
            System.out.println("other");
    }
}