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These things, in fact, are not difficult, but they are abstract and not easy to understand as a whole. It is suggested that readers: according to the relationship diagram, build a new project, write their own code (or refer to my code), and go through it according to the general idea, so as to understand its thoughts and understand it easily!　　两位男女主角务求将戏中饰演的少爷与老家佣的角色演得更淋漓尽致，引起大家的共鸣。在导演的安排下，春节期间特地到老人院探访，与一些曾当住家工的老人家见面，以了解他们当年工作的感受和情况，做足准备功夫。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia《美少女战士Crystal》第2期黑月篇将于2015年1月17日（周六）19:00在niconico动画等全世界同步发布。围绕美少女战士和幻之银水晶展开新的故事，请务必关注！“M 'entends-tu ?这部戏剧喜剧将我们带进了Ada、Fabiola和Carolanne这三位生活在贫困中的老朋友不寻常的日常生活中。V-shaped socks are not only beautiful, but also convenient to wear and take off.