题解 | 判断各类型字符个数

import java.util.Scanner;

public class Main 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        String sen=input.nextLine();
        int yinwen=0,shuzi=0,kong=0,qi=0;
        for(int i=0;i<sen.length();i++)
        {
            if(Character.isLetter(sen.charAt(i)))
            yinwen++;
            else if(Character.isDigit(sen.charAt(i)))
            shuzi++;
            else if(sen.charAt(i)==' ')
            kong++;
            else
            qi++;
        }
        System.out.printf("英文字母%d数字%d空格%d其他%d",yinwen,shuzi,kong,qi);
    }
}