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AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:英德学院的万人迷四人组F4终于毕业了。四人决定策划旅行，把目的地选在了西班牙。道明寺（言承旭 饰）积极邀杉菜（徐熙媛 饰）参与他们的西班牙计划。但是在临行前，道明寺和杉菜又吵起了架，似乎巴塞罗那之行即将泡汤。但鬼点子颇多的西门（朱孝天 饰）、美作（吴建豪 饰）和花泽类（周渝民 饰）最终让这对情侣搭上了飞往巴塞罗那的航班。来到了巴塞罗那的杉菜非常兴奋，而道明寺也在酝酿着一个计划，决定向杉菜求婚。但前往教堂的路上道明寺出了车祸，失去了记忆。眼看幸福的2人渐行渐远，失忆后的道明寺喜欢上了别的女孩；而花泽类则和杉菜越走越近；而西门和美作也有新的情况。最终F4和杉菜的故事会走向何方呢？一只叫紫悦的小马为了执行导师宇宙公主给她的任务，与助手穗龙一起来到小马谷学习有关友谊的知识。在小马谷中，她邂逅了几位好朋友，每只小马都代表着友谊的每个元素，并在和谐水晶中各扮演重要的关键元素。此后，紫悦便与她认识的新朋友们开始了有趣的日常生活。We can understand that the responsibility chain mode is a chain composed of processing requests. Requests are passed between these objects in turn until we encounter an object that can process it. We call these objects nodes in the chain. For example, object a sends a request to object b. If object b does not process, it will give the request to c. If object c does not process, it will give the request to d, and so on, until one object can process the request. Of course, if no object processes the request, then the request will leave the chain.北宋年间，皇帝徽宗性爱丹青，不理政事。奸臣高俅把持朝政，贪赃枉法，陷害忠良，民不聊生，一大批英雄豪杰被逼上梁山落草为寇面对混沌纷乱的江山，身心憔悴的宋徽贪恋着凡人的喜怒哀乐，一代名妓李师师的出现，更是让这个多情善感的皇帝彻底陷入意乱情迷之中。意想不到的是，这位风华绝代的京城名妓，竟然就是震动京师，令贪官权贵闻风丧胆的侠盗“飞将军”。浪迹江湖，放浪不羁的江湖浪子燕青，出于争强好胜，教训仇敌高衙内，抓住了正在行窃的“飞将军”，发现竟然是自己心仪已久的李师师……不知不觉中，江湖浪子又陷入了与一代帝王的红颜之争，同时也成了贪色成性的高衙内的咬牙之恨，更成了阴谋篡位的奸臣高俅的棋子。一场错综复杂的爱情情分由此展开，一修建上臣篡位的图谋暗暗的开始，混沌黑暗的世道顺便起一曲帝王名妓的爱恨绝唱，同时唱响了一首梁山好汉的英雄悲歌……Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.