题解 | #计算某字母出现次数#

就无脑直接遍历

import java.util.Scanner;
public class Main {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        String c = scanner.next();
        int cnt = 0;
        for(int i = 0; i < str.length(); i++){
            if(Character.toUpperCase(str.charAt(i)) == c.charAt(0) || Character.toLowerCase(str.charAt(i)) == c.charAt(0)){
                cnt++;
            }
        }
        System.out.println(cnt);
    }    
}