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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.多种原因共同作用下，项羽早就想杀了子婴一泄心头之恨。Ryan O’Connell主演的Netflix喜剧《#非同凡响# Special》因中了加州税务减免，故此获Netflix批准制作8集第二季。秦淼和紫茄对视一眼，吐了下舌头道：来不及了，刚才已经跟紫茄炖了一点。由上海SMG尚世影业和上海蓝星影视联合摄制的大型女性情感史诗巨制《风和日丽》男女主角历时半年多的层层筛选，终于尘埃落定。女主角杨小翼由在《奋斗》和《婚姻保卫战》中名声大噪的青年演员马伊琍出演，男主角刘世军由在《士兵突击》和电影《唐山大地震》中脱颖而出的新生代偶像小生李晨担当。 　　《风和日丽》作为今年上海市委宣传部重大文艺创作项目之一，将在今年六月投入拍摄，该剧由金牌编剧林和平、泳群操刀、著名导演杨文军执导。该剧将横跨上海、北京、浙江三地拍摄，投资巨大，卡司空前，力求打造一出制作精良、故事感人的精品佳作。斯科特·谢泼德、巴里·斯隆、迈克尔·卢沃耶、马梅亚·博阿福、斯通·布莱登和詹·阿特金森。