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这可不是边疆，这是京城。　　赵督军在戏园里听名角紫苏唱戏。柳爷赶来欲要回自己的大洋。谁知白风寨的唐景骑马冲进戏院，对着赵督军甩手一枪……混乱中，柳云轩护住柳爷往外逃，并伺机开枪打死了赵督军。柳云轩的举动震惊了柳爷，柳爷让他做柳家大院的师爷。 　　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.Figure 1 Example samp4_5 Runtime Interface本剧讲述了一所国际学校内音乐社和篮球社之间发生的故事。Article 18 Liability between Ships