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In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article:Public interface Visitor {Below the line has always been the main position of Osaka Weaving House. For a long time, the main task of Sakamoto Tmall Flagship Store has been to use the "online special fund" with beautiful prices to let customers experience the products, create brand impression, and then drain them to offline stores.Application layer attacks use more sophisticated mechanisms to achieve hacker targets. Application layer attacks do not use traffic or sessions to flood the network, but slowly deplete resources on the application layer for specific applications/services. Application layer attacks are very effective at low traffic rates. From a protocol point of view, the traffic involved in the attacks may be legitimate. This makes application layer attacks more difficult to detect than other types of DDoS attacks. HTTP flood, DNS dictionary, Slowloris, and so on are examples of application layer attacks.Fully Present General Secretary Xi Jinping's Important Thoughts　　某日，一帮穷凶极恶的劫匪袭击的实验室，昆丁最好的朋友在交火中不幸丧生，这让昆丁感到十分悲痛，他发誓要替朋友报仇，并且拟定了一个危险的计划。实验室正在研究一种由蜘蛛血提炼而来的药物，昆丁偷到了这种药物，并且将它注入了自己的血液之中。可怕的事情发生了，昆丁并没有变成强壮的蜘蛛侠，而是渐渐的成为了毛茸茸的大蜘蛛。The former is to query a DNS server for a non-existent server, while the latter is to query a real domain name.