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The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.一来二去的，眼看一个月又将过去。　　本剧以一个佛头为契机，情节曲折离奇，悬念叠出，连带出许许多多有意思的人和故事，并力求在吸引人的前提下，对蕴藏在生活喜剧表面之后的一些社会问题做了一个文化意义上的思索，为观众从最近的距离讲述了一个老百姓自己的故事……　　新的一季里，主要演员将悉数回归，并有Melanie Liburd (《Game of Thrones(权力的游戏)》)加盟，故事主线将继续围绕使刀锋猎人们相互猜疑、心生动摇的星际阴谋展开，据悉他们将参与寻找一件在未来战争中必不可少的装置。可奶奶是知道我的，从小性子就是这样的。Variables must be declared before they can be used黎水，不可莽撞。