题解 | #计算某字符出现次数#

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);
        String sourceStr =  in.nextLine();
        String regStr = in.next();
        int n = 0;
        if(regStr.length()==1&®Str!=" "){
            String [] strArr = sourceStr.split("");
            for(int i = 0;i<strArr.length;i++){
                if(regStr.equalsIgnoreCase(strArr[i])){
                    n++;
                }
                if(n>=1000){
                    return;
                }
            }
        } 
        System.out.println(n);
    }
}