题解 | #计算某字符出现次数#

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);

        String str = null;
        String c = null ;
        int f = 0;

        while(scanner.hasNextLine()){
            if(str == null){
                str = scanner.nextLine();
                }
            else{
                c = scanner.nextLine();
            }
        }
        char[] char_arr = str.toCharArray();
        Character char_of_c = c.toCharArray()[0];

        for(char i : char_arr){
            if(Character.toLowerCase(char_of_c) == Character.toLowerCase(i)){
                f++;
            }
        }
        System.out.println(f);
    }
}