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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.厌倦平凡生活的OL小山瑶香（奈绪饰）,在某次参观于百货公司举办的备前烧展览时,被一只大盤子迷得神魂颠倒,只靠著作者?备前烧作家〝若竹修〞这个线索,她辞掉工作,勇往直前朝向冈山县备前市飞奔而去,没想到找到俢之后却吃了个闭门羹,说什麼就是不肯收自己为徒,后来才发现俢的心里有着对过去的伤痕……At that moment, he became a stranger:我最近雇了一个女仆。这会子越王问话，大脑便飞速地旋转起来，分析起现在的实际情况来。从关中带回来的那三万军队多是北方人，水性较差。军事上的事情，在下不是很懂。