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The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.电视剧《向警予》根据舒新宇同名传记小说改编，由曾获中国电视“飞天”一等奖、“金鹰奖”的导演刘毅然执导。据悉，该剧将在湖南、上海、法国等地取景拍摄，预计2018年上半年在中央电视台播出。机缘巧合。没话说。Every time Zhao Mucheng told me his views on Liu Guiduo, he ended up with an exclamation.马可爱之父马东山、韩冰之父韩德昌、宋天明，号称豪森“三驾马车”，当年三兄弟创立“豪森酒店”。30年过后，马东山年老多病，韩德昌早死，而宋天明早年丢失了儿子。所以，董事长马东山生病之后，提出让马可爱来作为酒店继承人。与此同时远在国外的马可爱却遭遇了一场交通意外，濒死之后被告知父亲心脏病发作，马可爱急忙赶回国内，在经历了一系列事故之后，马可爱隐隐觉得，一连串事故背后，隐藏着巨大的谜团。为了解开谜团，她决定接受父辈的酒店，谁想到有更多阴谋和危险在等待着她，而勇敢的马可爱和夏雨行一起挫败了宋天明在酒店布下的种种阴谋，拯救了自己的家人，同时也收获了自己的爱情。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.