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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.Denial of Service: Any interference with a service that reduces or loses availability is called a denial of service派对要等到吸血鬼进来才开始。FX是我们在阴影中所做的，于2022年7月7日星期二返回。在Hulu上播放所有剧集。迎亲队伍跟昨日送妆的队伍一样，也绕道李家一圈，然后才往玄武公府来。洪氏一族八百余口，除了已死的荣郡王、宁王之子秦霖外，其余主谋如世子等人都被处以极刑，妇孺幼童等却网开一面，被流放三千里。There is no conflict between the network firewall and the host firewall. It can be understood that the network firewall is mainly outside (collective) and the host firewall is mainly inside (individual).