题解 | 判断各类型字符个数

import java.util.Scanner;

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......
        int [] arr = getCharCount(str);
        words = arr[0];
        numbers = arr[1];
        space = arr[2];
        other = arr[3];

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

    public static int[] getCharCount(String str){
        int [] arr = new int [4];
        char [] chars = str.toCharArray();

        for(char c : chars){
            if(c == ' '){
                arr[2] ++;
            }else if('0' <= c && c <= '9'){
                arr[1] ++;
            }else if('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z'){
                arr[0] ++;
            }else {
                arr[3] ++;
            }
        }

        return arr;
    }
}