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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.杨寿全振奋点头，我还怕不知怎么开口，你自己有主意了就好。　　播出时间：每周一至周五12：55Each component has its own coordinates, so if you want to adjust the coordinates of a map separately, the best way is to set it as a component.让他没想到，有些吃惊的是老头子和那些秦国人竟然选择了支持尹旭。黎章一震，不由眼睛红了。