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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.江成海打算成为最好的武侠作家后，才高调公布自己的身份，所以吕馨当然不会知道，这个海无量就是她嫌恶的江成海。在那个时代，胡宗宪不必损尽名节，也能保家卫国。　“Suam”可以看见鬼，不知不觉就成为Snow White 的间谍，他们的工作是执行国家命令！为了一大笔钱 ，Suam跟Dhanuruj要假装结婚，这个事情她一定不会拒绝。除了钱的事情外，成为间谍后，她还有其他的事情要调查。既然采访结束了，陈启也没有多留，便准备离开。那就好了。《青春有你2会员升级版》是依托于爱奇艺自制青年励志综艺《青春有你2》，打造的VIP专属衍生节目。节目将通过对内容的深度挖掘，塑造全新视角，为大众呈现主节目未播的训练生们的训练生活及台前幕后的准备过程。一来展现年轻人在追梦道路上不断努力奋斗，实现自我梦想的过程，并传递正能量的年轻人精神；二来记录训练生们的为期4个月的成长蜕变，从而多方面展现她们的成长过程和心路历程。