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知道了，好好演。As a result, we can certainly imagine that what we did at that time was not professional, and Push was much slower than the professional information platform. After all, we did not have a fast mechanism and backstage.她想问的是，为啥张家祭祖，竟然求起小狗来了，她刚才还没太听明白。大苞谷斩钉截铁地说道。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 EncyclopediaThe only use of * * is probably that I can't remember the name of the medicine when writing the plot of the Potions lesson * *This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).