题解 | #判断各类型字符个数#

import java.util.*;

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();

        //write your code here......

        for (int i = 0; i <str.length() ; i++) {
            char t = str.charAt(i);
            //空白字符
            if( Character.isWhitespace(t)){
                space ++;
            }else if(Character.isLetter(t)){//字母
                words ++;
            }else if(Character.isDigit(t)){
                numbers ++;
            }else{
                other++;   
            }
            
        }

        System.out.println("英文字母"+words+"数字"+numbers+"空格"+space+"其他"+other);
    }
}