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Differences between simple factories and factory methods: Simple factories and factory method patterns look very similar, especially specific factories in simple factories and factory methods. Simple factory, all things have been done in one place. However, the factory method creates a framework for subclasses to decide how to implement it. For example, in the factory method, the OrderPizza method creates a general framework to create pizza. The OrderPizza method relies on the factory method to create specific classes and make actual pizza. It is possible to decide what the actual products manufactured are by inheriting the factory. Simple factories do not have this flexibility.秦军终于支撑不住，刚刚布置的防线再次被楚军击溃。Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.先婚后爱，一个错误的新闻报道使男主与女主相识并成了一对欢喜冤家，无意中女主又发现被男主一家对外称去逝的男主的妈妈其实在一家精神病医院，在男主妈妈的威逼下男主与女主结了婚并引来了一连串啼笑皆非的故事。遵义会议是中国共产党第一次独立自主地运用马克思列宁主义基本原理解决自己的路线、方针政策的会议。在极端危险的时刻，挽救了党和红军。它是中国共产党历史上一个生死攸关的转折点。这部影片由苏区大撤退、湘江血战、遵义曙光、飞跃大渡口、陕北会师五部分组成。该剧讲述了一所影视类高校里，发生在两个宿舍，八个年轻人身上的故事。反映了当代大学生，离开父母怀抱，独立面对社会，面对成长，面对每一个崭新的人生课题时，所发生的荒诞、搞笑，也是这个年龄人所特有的故事。从他们天真、清纯的视角，反映出了很多社会的热点问题。八位年轻人，四男四女，来自2个宿舍，这两个宿舍，一墙之隔，在阳台上相互交流。19集以系列剧的模式呈现，每集独立成为一个故事，其中讲述了梦想、科技、环保、心里救助、友谊、星座、就业、追星等妙趣横生的小故事，展现了当代大学生青春、活力、正能量但充满奇思妙想的生活。除此之外，还有一个原因就是，这些人依然看好启明的未来，相信启明比星海更加有前途。