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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.曾经在赛车界叱咤风云、如今却只能经营炒饭大排档的赛车手张驰（沈腾饰）决定重返车坛挑战年轻一代的天才。然而没钱没车没队友，甚至驾照都得重新考，这场笑料百出不断被打脸的复出之路，还有更多哭笑不得的窘境在等待着这位过气车神……-Fen!丽芙在父母苹果树的安全和安德里亚的进步带来的令人兴奋的城市生活之间左右为难。。。The running environment of gitlab consists of three parts: postgresql database; Redis Caching Service; Gitlab service1976年的一个夏天，三十六颗炸弹在克里夫兰市里被引爆。当时，爱尔兰黑道分子丹尼·格利因正如火如荼地和意大利黑帮进行一场地盘争霸战。Jin Zhengxun