题解 | #计算某字母出现次数#

import java.util.Scanner;
public class Main{

public static void main(String[] arg){
    Scanner scan = new Scanner(System.in);
    //字符串1
    String s1= scan.nextLine();
     //字母
    String s2= scan.nextLine();
    //int i =0 ;
    //用于统计字母出现的次数
    int count =0;
    if(s1.length()>=0&&s1.length()<500){
      //保证代码的大小写均能识别
      for(int j=0;j<s1.length();j++){
          if(s1.charAt(j) == s2.charAt(0)
             ||s1.charAt(j) == s2.toLowerCase().charAt(0)
             ||s1.charAt(j) == s2.toUpperCase().charAt(0)
            ){
             count++;
          }       
      }
      System.out.println(count);
    }     
}

}