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Now, the PizzaStrore (FactoryPizzaStore) is abstract. The CreatePizza method has been migrated back from the simple factory. In PizzaStroe, the CreatePizza method is now abstract.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.吃只乌龟本不算什么，可是张家地底下的那些乌龟，大的比磨盘还大，看着就心惊胆战，谁敢吃？就算小的也不敢吃，小乌龟不是人家的龟孙子么，你吃了人家的孙子，那也讨不了好。Conclusion of physical examination and appraisal.TelecommunicationsThe second is to ensure high-quality online live learning effect and experience, so the technical research and development requirements for online platforms will be higher and higher.《倚天屠龙记》已经连载的两章。