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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.此剧讲述讲述手工鞋匠孝燮家四兄弟姊妹，在遇到大楼主人兼富者的继母后发生的故事，以愉快的笑容与感动去描述60代 (60~69岁) 中年父母世代与20、30代 (20~39岁) 子女世代的暧昧与争吵、爱情与战争，透过这些故事让观众明白到家人的意义。你一千元就想买这张亲笔写了一百多字的书签？我很穷，出不起高价，但是只要是超过七十字的书签，三千一张，有多少，我要多少。Some software developers always want to set up a certain design pattern when designing programs. In fact, this is wrong and they do not really master the idea of design pattern. In fact, many times readers use a certain design pattern, but they just don't know what the name of this pattern is. Therefore, when designing programs, we should use appropriate design patterns according to our own understanding.望着面前的院墙。我的妈啊。