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However, during the working day, the landlord still needs to learn, please understand the little cute people.一个人选择和爱说永远的再见，而另一个人会在“命运”让他们再次相遇的时候回来作出妥协/knneel (kneel down)For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.徐风侧头看窗外，一阵阵觉得憋屈。The algorithm takes advantage of the retransmission characteristics of TCP/IP protocol. When the first syn packet from a certain source IP arrives, it is directly discarded and recorded in the state (quintuple). When the second syn packet from the source IP arrives, it is verified and then released.