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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.2. Expansion and development are not restricted by regions;某日，一股邪恶的势力出现，阿历的两个妹妹火怜（喜多村英梨 配音）和月火（井口裕香 配音）遭到了绑架，同时失踪的还有独臂少女神原骏河（泽城美雪 配音），目的只有一个，那就是逼迫阿历就范。就这样，阿历和余接一起踏上了救援的旅途，最终，他能否抵抗命运，并且救回生命中重要的人们呢？超级网剧余罪由新丽传媒联合爱奇艺共同制作，张睿执导，改编自常书欣同名IP小说《余罪》，由张一山、孙佳雨、吴优势等领衔主演。该剧讲述警校学生“余罪“从一场特殊的选拔开始，进入了生活和社会矛盾之中，且在成为一个卧底后遭遇各种惊险事件的故事。郑家有这样的大喜事，却因为张大栓猝然去世，也没心情大办，只摆了几桌酒席，请近亲和黄豆的师长等来聚了一天。Bow 1.2颜泽是一个平凡的女孩。她没有绝丽的容颜，也没有高挑的身姿，成绩中上。与她形成鲜明对比的，是她最好的朋友顾夕夜。顾夕夜是颜泽家的养女、颜泽的姐妹、颜泽最好的朋友，也是她的生命不可承受之轻。 夕夜不但漂亮、成绩优异，还博学多才。因为夕夜的出现，加诸在颜泽身上的所有光环，都被抢走了。所有能够见到夕夜的地方，颜泽仅仅是如影随形。 颜泽偷偷暗恋着同桌——校草季霄。当颜泽发现，季霄可能喜欢顾夕夜之后，她与夕夜间的感情变得更加微妙和脆弱。嫉妒、不满、争吵，全面爆发。颜泽所有的小心思，全都被转学生贺新凉看在眼里。贺新凉总是在颜泽最悲伤、最沮丧的时候“恰巧”出现，用自己乐观积极的情绪，将颜泽从“嫉妒的谷底”拉出。 然而，和贺新凉越走越近的颜泽却触怒了顾夕夜。顾夕夜暗恋着贺新凉，也在默默羡慕着人缘极好的颜泽。她的骄傲并非本意，只是不知道如何可以像颜泽那样融入大家。两个看似亲密的女孩，却各怀心事，疯狂想要成为像对方那样的人。终于，在经历了一系列微不足道却刻骨铭心的事之后，她们学会了认同自己、接纳自己，也渐渐地成