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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.221. X.X.233话未说完，秦淼已经笑得弯了腰。Step 1: Shutdown. The premise of DFU is that iPhone is turned off.Lv1-30 Skill +1StandardDetermine and adjust the hourly minimum wage, On the basis of the monthly minimum wage standard promulgated, the basic old-age insurance premium and basic medical insurance premium that the unit should pay should be considered. At the same time, the differences between part-time workers and full-time employees in terms of job stability, working conditions, labor intensity and welfare should also be properly considered.