题解 | #计算某字符出现次数#

import java.util.HashMap;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        char[] a = in.nextLine().toCharArray();
        String b = in.nextLine();
        int sum = 0;
        for (int i = 0 ; i < a.length; i++) {
            if (b.equalsIgnoreCase (String.valueOf(a[i]))) {
                sum += 1;
            }
        }
        System.out.print(sum);

    }
}