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当今世界，有两个超级大国，华国和美国。@ Nosferatu: Death is our final destination, so it can also be said that death is our eternal nostalgia.多虑了，此三者，明廷妇人之愚，倭寇乌合之众，唯弗朗机乃豺狼猛虎。车里面的人正是叶琳琳。墨西哥贩毒团伙老大何塞·里维拉，近期在伊斯坦布尔扩展毒贩业务，不断除掉那里的毒枭，霸占毒品销售市场。大王，您的意思是韩信能够很快占领齐国？陈平小声探问。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.