//第一题:镜面反转,ABA 为NO,AHA为YES,ABC为NO,只需找到反转后和原来相同的字母('A','H','I','M','O','T','U','V','W','X','Y'),并判断是不是回文 public class Main { public static void main(String[] args) { Set<Character> set=new HashSet<>(); Character[] chars={'A','H','I','M','O','T','U','V','W','X','Y'}...