题解 | #计算某字符出现次数#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scanner=new Scanner(System.in);
        String textOne=scanner.nextLine();
        String textTwo=scanner.nextLine();
        textTwo=textTwo.toUpperCase();
        char[] chars = textTwo.toCharArray();
        char text2 = chars[0];
        int total=0;
        char xiaoxie;
        textOne= textOne.toUpperCase();//不管是有多少大写还是小写，统统转换成大写，
        
        for(int i=0;i<textOne.length();i++){
        if(text2<='Z'&&text2>='A'&&textOne.charAt(i)==text2){
            //说明是大写字母
            total++;
        }else if(text2>='0'&&text2<='9'&&textOne.charAt(i)==text2){
            //说明是数字
            total++;
        }
        }
        System.out.println(total);
    }
}