题解 | #统计字符串中字母出现次数#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String string = "H e l l o ! n o w c o d e r";
        Scanner scanner= new Scanner(System.in);
        String word = scanner.next();
        scanner.close();
        System.out.println(check(string, word));
    }

    public static int check(String str, String word) {
        // 自定义一个计数器
        int count = 0;
        // 遍历这个字符串
        for(int i = 0 ; i < str.length(); i++){
            char arr = str.charAt(i);
            if(word.equals(arr + "")){
                count += 1 ;
            }
            
        }

        return count ;

    }
}