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In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.故事灵感来源于厨师、作家及电视节目主持人Julia Child的非凡人生，以及她具有开创性的电视节目《法兰西厨师》。通过Julia和她乐观敢闯的态度，本剧将探索美国历史上一个不断发展的时期：公共电视作为一种新的社会制度出现，女权主义和妇女运动，名人的本质，以及美国的文化发展。就核心而言，本剧刻画了一段充满爱的婚姻中，变化且复杂的作用力。Https://www.jiemian.com/article/1971548.htmlLoad from native module女主人公方若瑄幼年时在家里的老宅子遇到了一场事故，导致她失去了童年的记忆，之后被家人接到国外生活。方若瑄成年之后，父亲去世。她为了完成父亲遗愿，带着父亲的骨灰回到祖国。回国后的方若瑄再次回到了曾经家里的老宅子，此时的老宅子已经被建成了一所医学院。方若瑄来到学校之后发现，只有一口枯竭的玲珑井还保留着老宅子的影子。而且，每当她走到玲珑井前，脑海中就会闪过一些模糊记忆碎片。她隐约意识到这口井和自己失去的记忆存在某种联系，于是她申请了在医学院借读，以便更好的了解玲珑井。同时，她也认识了学生陈博飞，两人很快发生了恋情。方若瑄搬进了学校之后不久，却遇到了一系列诡异的事情，并得知曾经有一名女学生在此跳井自杀。她怀疑这一切就是这名跳井自杀女学生在作怪，而正在这时方若瑄的男友陈博飞也突然失踪……在Rosewood镇宁静的外表下，隐藏着不少秘密。三年前，镇上四个最漂亮的女生——Aria（露西·海尔 Lucy Hale 饰），Spencer（特莉安·贝利索里奥 Troian Avery Bellisario 饰），Hanna（艾什莉·本森 Ashley Benso n 饰）和Emily（薛·米契尔 Shay Mitchell 饰）的朋友、学校最受欢迎的女生Alison（萨莎·皮特丝 Sasha Pieterse 饰）突然失踪，四人发誓保守秘密但关系却渐行渐远。三年之后，四人收到神秘人A发来的短信，知道她们隐藏了很久的、只有Alison才知道的秘密。以为A就是Alison，然而警察在Alison的后院里找到了她的尸体，神秘的A始终是个谜。四个女生将如何面对这一切变故？Java is a typical object-oriented programming language, so this tutorial is based on Java to explain these 23 design patterns. If you don't know Java, please hit the "Java Tutorial" to learn.