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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.Iterative sub-patterns: Iterative sub-patterns can sequentially access elements in an aggregation without exposing the internal appearance of the aggregation. The aggregation of multiple objects is called aggregation. Aggregation objects are container objects that can contain a group of objects. Iterative subpatterns encapsulate iterative logic into a separate subobject, thus separating it from the aggregation itself. Iterative subpatterns simplify the aggregated interface. Each aggregated object can have one or more iterative subobjects, and the iterative states of each iterative subobject can be independent of each other. Iterative algorithms can be independent of aggregation role changes.　　《窈窕淑女》主要讲述了夏敏津由视金钱为万能的拜金女转变为明白爱情真谛的女孩。她这样的转变要归功于心地纯洁的永皓。永皓在经历了失去郁萱的痛苦之后，读完学位就回家帮助母亲经营年糕店，过着与世无争的平淡生活。直到与夏敏津不期而遇，触动了他内一部以母亲的视角，描述一群具有所谓叛逆精神的青年“义”字当头、肆意独行，肆意妄为，在受到生活和法律的双重惩罚后，在母爱的召唤下重建正确的道德与精神世界，重新开始积极、健康、向上的生活之路。同时对作为母亲的淑红和一些家长做了现实主义的批判，对母爱的诠释做了积极的探讨和重新定位！对现代青年的独立、自主、敢于奋斗的精神和行为做了积极的肯定。对物质和精神世界的关系做了实事求是的客观褒贬。对家庭在社会道德规范重建所起的作用做了积极的探求。全剧溶进了某些情节剧的元素，悬念、案件。Next, we extended the shovel to the Korean star.去年燕人来攻邯郸，孩子被征召去守城，死在城墙上……农户也哭了起来，说道。《兄弟车行》从贫民视角切入，贴近生活，贴近百姓，讲述了在北京胡同里长大的三兄弟互相扶持、同甘共苦，经历各种金钱与欲望的诱惑的一系列故事。剧中人物的心态与行为，会使更多的观众感到亲切和认同。《兄弟车行》区别于目前泛滥于屏幕的生编乱造没有生活基础的电视剧，给我们带来一场关于当下亲情、爱情、友情的盛宴。