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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.率真直爽的美丽女孩瑾瑜（刘诗诗 饰）自幼在狼群中长大，塞北的辽阔粗粝打磨了她坚毅隐忍的性格，而对中原儒家文化的学习也让她对那个春暖花开的国度心驰神往。两次意外，让瑾瑜先后结识来自建安的莫循（胡歌 饰）和卫无忌（彭于晏 饰）。以此为契机，莫循、卫无忌和瑾瑜（改名莘月），启程前往人头攒动、熙攘喧嚣的建安城。几经周折，她在九爷莫循的支持下经营起落玉坊，她对九爷一往情深，后者虽然也喜欢这个率真美丽的女子，却因自身原因不敢越过情感的界限。而在南朝担当大将军卫无忌也尤其喜欢古灵精怪的瑾瑜，为了心仪的女孩情愿早点跳脱凶险非常的宫廷之争。风云激昂的年代，有情人儿的传奇如是上演……在 17 世纪的意大利，一名被控使用巫术的年轻接生员必须做出选择：是追求命运多舛的爱情，还是遵从自己强大的命运。其实单纯以地域而论的话，诸侯之中优势最大的莫过于关中，可惜了，项羽竟然舍弃了关中之地……关中所在秦国故地，地处西北边陲，邻国不多，彼此之间发生碰撞和摩擦的机会也就少一些。