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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.　　从插队知青变成“保姆”的奚美娟，女儿因是当红歌星而对其实是生母的“保姆”态度骄横跋扈，面对身为雇主的亲生女儿却含泪不能相认。《保姆妈妈》还有更多的现实故事元素，如巫刚扮演的大学教授当年在做知青时，曾为前途不惜抛妻弃子，高露扮演的红歌星未婚先有子等，都是社会上各种现象的缩影。踞天下富庶之地，倒要看看那道士皇帝如何修仙。我还要去上班，下次再聊。During the creation of an object by Spring, the dependent attributes (simple values, collections, and objects) of the object are set to the object through configuration华灯映照之下，一老一少两位此刻几乎主宰天下的强者迎面走来，气势磅礴，众人不由自主地都站起身来迎接。不过，我跟胖子一家要跟着小姐，丢下小姐一个人可不成。