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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.偷不走的现在 电影《念念手纪》宣传曲 -- 于文文In fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are　　罗刚(唐丰饰演)与安邦是兄弟关系，很巧合也在成功岭受训。他的个性桀骜不驯，与安邦又有解不开的心结，两人在成功岭上狭路相逢，到底会发生多少火爆冲突？在下级必须服从上级，最重伦理的军中，罗刚到底要如何自处？哈哈。为了打造千骑系统，天津垓指使亡去给灭亡迅雷站送密钥，与灭的接触以及天津垓对待属下的恶劣态度，让亡动摇不已。千骑诞生后，功不可破的亡却并没有得到好下场……\\"