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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.　　怀抱梦想的年轻乡村歌手贝利（凯萨琳·麦菲饰）眼见事业和私生活变调，只好接下新工作，替一个名叫博（埃迪·希布莱恩饰）的粗犷牛仔照顾五个小孩。她这位新手褓姆凭藉迷人的南方气质和愈挫愈勇的性格，从容应对雇主家庭的种种状况，充当他们缺席已久的母亲角色。但她却万万没有想到，这个具有音乐天分的家庭竟让她重圆星梦，组成她梦寐以求的乐团。《君之烙烤烘焙》是一档以烙烤为主题的美食节目。该节目运用简单的食材，细致的烹饪流程，快速教会大家在家中就能做出如同蛋糕作坊一样的美味蛋糕。此人终于意识到，就算是熬，自己也不一定熬得过他老人家。老将军六十出头，下颌长须一直拖到胸口，面部线条刚毅，目光森寒。At that time, the post on the parent-child kingdom