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为此，吕文心还特意打来电话，千叮咛万嘱咐，希望陈启三思而后行。世界第一的暗杀者投胎成暗杀世家的长男重生了。AOP can encapsulate the logic or responsibilities (such as transaction processing, log management, authority control, etc.) that have nothing to do with the business but are jointly called by the business modules, which is convenient to reduce the repeated codes of the system, reduce the coupling degree between modules, and is conducive to future scalability and maintainability.Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:/volunteer (voluntary)