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3.13The third adapter mode is the adapter mode of the interface, The adapter for the interface is as follows: Sometimes we write an interface with multiple abstract methods, When we write the implementation class for the interface, All methods of the interface must be implemented, This is obviously wasteful at times, Because not all methods are what we need, Sometimes only a few are needed, In order to solve this problem here, we have introduced the adapter mode of the interface. With the help of an abstract class, the abstract class implements the interface and all methods. However, we do not deal with the original interface, but only get in touch with the abstract class, so we write a class, inherit the abstract class and rewrite the methods we need. Take a look at the class diagram:进来后，果见小两口正对面说笑，你一口我一口地合吃豆腐干呢。你都好了，还躲在家干嘛？我跟你说，板栗他们回来了。于是，雷老大凑了一千两银子，买下了大汉的锈剑。The attacker sends a large number of HTTP messages to the target server through proxy or zombie host, requesting URI (Universal Resource Identifier) related to database operation or other URI that consumes system resources, causing the server to run out of resources and cannot respond to normal requests. For example, HTTP Flood attacks often occur on portal websites. The biggest feature of attacks is to select URIs that consume server CPU or memory resources, such as URIs with database operations.