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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.他能否明白自己的一番苦心？会自己还有怨言吗？若是韩信的怨恨一直持续到今日，尹旭难免会失望，并非因为失去韩信的心而难过。By default, it is installed on disk C of the system disk bar, and it is directly hit. After all, it is 150G when dividing the disk. You are free to do so.2. In addition, you can also use flow cards to surf the Internet, such as wireless network cards with mobile phone cards. When flow is turned on, you can also connect on a tablet computer.FC imported by oneself那我问完了。我从未顶撞过你们爷爷奶奶，就有不同想法也是用劝的，对你们小叔也是如此。