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 sc = new Scanner(System.in); String str =sc.nextLine().toLowerCase();//都变成小写 String s = sc.nextLine().toLowerCase(); int l = str.length(); l=l-str.replaceAll(s,"").length();//用代替的方式删除所有要计数的字符
System.out.println(l); } }