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 in = new Scanner(System.in);
        String str=in.nextLine();
        int charCount=0;
        int spaceCount=0;
        int numCount=0;
        int otherCount=0;
        for(char a:str.toCharArray()){
            if(Character.isLetter(a)){
                charCount++;
            }else if(a==' '){
                spaceCount++;
            }else if(Character.isDigit(a)){
                numCount++;
            }else{
                otherCount++;
            }
        }
        System.out.println(charCount);
        System.out.println(spaceCount);
        System.out.println(numCount);
        System.out.println(otherCount);

    }
}