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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.杨长帆就此吼道：你们听好了，我杨长帆与诸位无冤无仇，率大军来此也从不是要杀谁，不过是要取回属于我自己的东西。的确，他说的对，再高的视野，再多的知识，也掩盖不了自己履历单薄的事实，这样的大风大浪，还未到来已经令他发抖。Public abstract void work ();这是一个关于前世今生蛇姬复仇讨情债的故事！. Code: ^ ^; Ha ha; Ha ha; Hey, hey, wait.The "Xi Jinping Journal" includes the daily important activities, meetings, speeches, articles, studies, overseas visits, instructions, letters, congratulatory messages, orders, etc. of General Secretary Xi Jinping since the 18th CPC National Congress. Select a date and you can easily query his activities on that day.