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接着，她正色道：这话甭再说了。A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.夜长梦多，等项羽结局来齐国，回过神来，函谷关未必能够抵挡住项羽的兵锋。该剧取材于当今社会的争议话题之一 —— 大学生同居.虽然话题敏感,但很贴近生活.本剧以生动有趣的人物形象和诙谐幽默的喜剧风格,讲述大学生在学校外面合租的一些趣事.被热议为网络版《武林外传》和中国版《老友记》. 剧中每个成员都具有鲜明的个性,例如有洁癖的安宁,爱显摆的小宝,嗜赌的老车,...长剑挥动，武当四大长老，两人断剑，两人重伤，四大弟子作鸟兽散。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.于是，黄瓜黄豆就跟红椒出去了，另带了白胖子和虎子，还叫了两个护卫赶了车拿东西。