题解 | #计算某字符出现次数#

代码实现：

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        String input1= s.nextLine();
        String input2 = s.nextLine();
        String split3 = input1.toUpperCase().replaceAll(input2.toUpperCase(),"");
        System.out.println(input1.length() - split3.length());
    }
}