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) {

        //write your code here......
        // 记录字母在字符串中出现次数
        int num = 0;
        for (int i = 0; i < str.length(); i++) {
            String ch = String.valueOf(str.charAt(i));
            if (word.equals(ch)) {
                num++;
            }
        }
        return num;
    }
}