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3、喷嚏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.　　再后来战争爆发了，灾难如同洪水般席卷过来，原是美丽的城市变得一片破败。艾尔充军，鸟孩深深依赖着的心爱的金丝雀撞在玻璃窗上痛苦地死去。原充盈着的心中两个重要的位置刹时间空虚，精神的世界面临着崩塌的威胁。于是，鸟孩也参军了。The second method: black screen recovery本来丈夫就不是很喜欢女人干预政事，尤其是在这件事情上自己作为国母是和大权在握的丞相站在一条线上。足立慎吾监督！A-1 Pictures原创TV动画《Lycoris Recoil》2022年放送决定！Below the line has always been the main position of Osaka Weaving House. For a long time, the main task of Sakamoto Tmall Flagship Store has been to use the "online special fund" with beautiful prices to let customers experience the products, create brand impression, and then drain them to offline stores.