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25. Spend every day, every week and every month writing.One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.为了大力弘扬爱国主义精神，北京市润亚影视传播有限公司决定重新拍摄经典电影《小兵张嘎》的电视版。电视剧在忠实《小兵张嘎》原著故事线索，氛围环境的基础上，丰富了嘎子的性格命运。展示了嘎子、胖墩、玉英、佟乐四个孩子，在抗日烽火中的戏剧故事和富于传奇的童稚友谊。Intermediator mode: Pay attention to the interaction between encapsulated objects, and decouple by encapsulating the complex interaction between a series of objects so that they do not need to explicitly refer to each other.他站起身，单手按在黎章肩膀上，想说什么，终究还是没说出来。Since it is a content-based product, the foothold of the operation is content, and the final output form is also content. Therefore, in order to sort out a main line, the content needs to run through the whole process, and the final income is DAU or cash.一短颈肥身，单目有神的中年胖子笑呵呵入厅，正是严嵩的亲生儿子严世藩。