题解 | #计算某字符出现次数#

import java.util.*;
import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner s=new Scanner(System.in);
        String all="";
        String one="";
        char[] ac;
        //char temp;
        int num=0;
        while(s.hasNext())
        {
            //String str1=s.toUpperCase();String 转化为大写
            //String str2=s.toLowerCase();String 转化为小写
            //String字符转换，s.toCharArray()与s.charAt(index)
            //char字符转换，String.valueOf(c)转化为String
            all=s.nextLine();
            one=s.nextLine();
            //存放原来所有的
            ac=all.toCharArray();
            //存放要的字符
            //temp=one.charAt(0);
            for(int i=0;i<ac.length;i++)
            {
                if(one.equalsIgnoreCase(String.valueOf(ac[i])))   
                    num++;
            }
            System.out.println(num);
        }
         
    }
     
}