题解 | #计算某字符出现次数#

public class Main {

    public static void main(String[] args) {
         Scanner scanStr = new Scanner(System.in);
        String str = (scanStr.nextLine()).toUpperCase();
        char ch = scanStr.next().toUpperCase().charAt(0);
        int length = str.length();
        System.out.println(length - (str.replaceAll(ch + "", "").length()));
    }
}