Java文字の検索

import java.util.Scanner;

public class Main {
    public int solution(String str, char t) {
        int answer = 0;

        str = str.toUpperCase();
        t = Character.toUpperCase(t);

        for (char x : str.toCharArray()) {
            if (x == t) {
                answer++;
            }
        }

        return answer;
    }

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

        String str = scanner.next();
        char c = scanner.next().charAt(0);

        System.out.print(main.solution(str, c));
    }
}