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I like what Sister Ping said: "I like to do one thing instead of insisting on doing one thing." Many people say that one must stick to it. If it grows in your blood and is as natural as eating and sleeping, it does not need to "stick to it" and just do it. Saying "stick to" is because you don't love enough, so you need to remind yourself all the time.最滑稽的事情出现了，浙江总兵护卫东海大盗。Beijing隋朝末年，中原大旱。唯有洛河附近的程子沟村因水得福，秋庄稼长势喜人。正当村民们暗自高兴之时，不料，山贼黄鼠放言，要在秋收之时洗劫程子沟。Belonging Province雷指挥诧异地说道：我说老常，你脑子没病吧？他们才救了我的人，那地儿隔着西边差了几百里不止，他俩连马也没有，你也忒会想象了。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