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At present, there is no firewall that can protect DNS server attacks, only a few professional protection equipment can do it.We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.First, enter "Settings";Creative patterns are patterns used to create objects, abstracting the instantiation process. All creative patterns have two things in common. First, they all encapsulate the specific types of information used by the system. Second, they hide how instances of these classes are created and organized. Creative patterns include singleton patterns, factory method patterns, abstract factory patterns, builder patterns and prototype patterns.航海的传统与底蕴，绝非一朝一夕铸成，无论是欧洲地中海的混战，还是日本的倭寇行径，都通彻千年，融入了每一个人的骨髓。