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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.每次利用良好的机会扩张，手段从来不曾这样激烈，没想到这次倒是一反常态。吴美丽向来心无大志，嬉戏人间。因一次仗义出头被大耳窿追债而结识常温，二人惺惺相惜，温提议丽到他家里暂避风头，岂料途中又倒霉遇上车祸。丽侥幸无恙，温却重伤昏迷。 凤斗智随之而起。她肤色白净，只是眼睛有些小，鼻子稍显矮。一个至死不渝的誓言，一段生死离别的爱情，编织着一个爱情故事！ 　　一个关于信仰的真实传说，一个关于爱情的凄美童话，一曲关于生命的悲惨挽歌。 　　该剧围绕两男一女的情感纠葛展开故事：孤儿欧阳、父母被打倒的闻汐与寄养在外婆家的叶雨三个人青梅竹马，分别之际叶雨留给了欧阳一份纯真的誓言“长大了我来找你，别忘了”。成年后的三人境遇迥异，失去唯一的亲人叔叔的欧阳终于考上了大学，进入省城后先后重逢了已是高干子弟的闻汐和富家女叶雨。艰难养活自己的欧阳在得知闻汐也钟情与叶雨时，自尊心驱使欧阳拒绝了叶雨的誓言。毕业后欧阳被分配到边远的小镇，几年后他重回省城，落魄谋生。在遭遇一场火并案后，一切真相大白，最终欧阳和叶雨重逢在了海边……虐恋情深之帅气摄影师恋上单纯富家女！以欺骗开始并被长辈反对的爱情，会有好结局吗？ ​​​​