计算字符个数

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        while(in.hasNextLine()) {
            int num = 0;
            String strAll = in.nextLine();
            String strOne = in.nextLine();
            String s1 = strAll.toUpperCase();  // 转换成大写（注意String不可改变性质）
            String s2 = strOne.toUpperCase();  // 转换成大写
            strAll.toUpperCase();
            strOne.toUpperCase();
            char[] chAll = s1.toCharArray();
            char[] chOne = s2.toCharArray();
            for(int i = 0; i < chAll.length; i ++) {
                if(chAll[i] == chOne[0]) {
                    num ++;
                }
            }
            System.out.print(num);
        }
    }
}