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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.是敌是友以后才说的清楚。The recommended design patterns for pad patterns of commonly used patch components in the company are as follows:Through President Nolan's speech, the audience learned that Wilton Preparatory College, which has a 75% Ivy League graduation rate, strictly implements the "Tradition"; Honour; Discipline; Excellent "school motto. This also set an extremely depressing tone for the school early on and laid a big background for the future development of things.《海盗王怒追落跑新娘》是《一夜新娘》的CP速看剧情版，以情话夫妇花溶和秦尚城的CP视角来该讲述狂傲海盗王和将门侠女之间“高糖甜宠”的浪漫爱情。真是人比人得死，剧比剧得扔。司令。