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......

        /** 转换成StringBuilder 遍历数组，对比并记录出现次数 */
        int result = 0;
        StringBuilder sb = new StringBuilder(str);
        for(int i = 0; i < sb.length(); i++){
            if(sb.charAt(i) == word.charAt(0)){
                result++;
            }
        }

        return result;
        

    }
}