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Do you understand?天启老师，到时我一定去看这部电影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."P2P explodes 100 times a month" sounds horrible, but not all P2P platforms are really defined as fraud cases like investors.Iptables provide us with the following categories of rules, or, in other words, iptables provide us with the following "tables."Well, the concept of IPTables is summarized here for the time being. After understanding the concept, it is absolutely appropriate to practice it in combination with actual commands.