题解 | #计算某字符出现次数#

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

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String in = br.readLine();
        in.toUpperCase();
        int character = br.read();
        int[] b = new int[255];
        char[] c = in.toCharArray();
        for(int i =0;i<in.length();i++){
            b[(byte)c[i]]++;
        }
        if(character>=65&&character<=90){
            System.out.println(b[character]+b[character+32]);
        }

        if(character>=97&&character<=122){
            System.out.println(b[character]+b[character-32]);
        }
        if(character>=0&&character<65||character>90&&character<97||character>122){
            System.out.println(b[character]);
        }
    }
}