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 in = new Scanner(System.in);
	  // 为了让字符匹配，我们默认全部都用小写字母
        char[] line = in.nextLine().toLowerCase().toCharArray();
        char target = in.next().toLowerCase().charAt(0);
        int sum = 0;
        
        for (int i = 0; i < line.length; i++) {
            if (line[i] == target) {
                sum++;
            }
        }

        System.out.println(sum);
    }
}