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State mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to executeWe 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.The visitor mode is more appropriate when changing the algorithm, because the visitor mode makes it easy to increase the operation of the algorithm.Any feedback mechanism will be weaponized to attack legitimate users and content.周勃也到底是个硬骨头，要是一般人，在这样的情形之下可能就直接投降了。本作是少女漫画杂志的玛格丽特和视频发送服务？Hulu搭档的恋爱电视剧系列《玛格丽特LoveStories》的第2弹。拥有美丽歌声和容貌的主人公，因为经常说真话而被称为恶魔？可爱的玛利亚，以转校为契机发现理解者，并与同学们建立起羁绊。