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4. The switching relationship between states is just piling up if and else statements in the buttonWasPressed method. Adding or modifying a state may require changing several operations, which makes buttonWasPressed more difficult to read and maintain.美版生人勿进是2010年马特·里夫斯执导的美国电影。影片中欧文是一个孤独的并且经常受人欺负的12岁小男孩，他的新邻居是一个神秘的年轻女孩艾比，他们做了朋友。恰逢周围发生了一系列令人毛骨悚然的事件，欧文了解到，他的新朋友是一个吸血鬼，但是他们之间友谊的力量却远远强大过恐惧。但原本平静的小镇接连发生了几起命案，这一切好像都与艾比有关，小镇迅速被死亡的阴影笼罩。原来是艾比的“父亲”在帮艾比找人血，他将人残忍的杀害榨干其血给艾比喝，但在一次事件中艾比的“父亲”意外毁容，在他生命的最后一刻他把自己的血献给了艾比In real life, there are many intermediary modes, such as QQ game platform, chat room, QQ group and SMS platform, which are all the applications of intermediary modes in real life.Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode."Well, they all have four legs, run fast and bite very hard." Liu Guangyuan said.親切成金 萩原聖人 伊藤裕子["Exclusive" Road Map for Inter-provincial Arrest of Doctors Exposed: Lawyers Confirm Hongmao Medicated Liquor Has Participated in the Whole Process]