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玉米快速地溜下树干，刚落地，感觉有东西扯住了裤腿，吓得他差点尖叫。小说中，随后，悟空道人说到了如来和冥河教祖。入学倍率10～20倍，不仅是学科考试，身体·运动机能检查等资质也被问的窄门。The intermediary mode is also used to reduce the coupling between classes, because if there is a dependency relationship between classes, it is not conducive to the expansion and maintenance of functions, because as long as one object is modified, other related objects have to be modified. If you use the mediator mode, you just need to care about the relationship with the Mediator class, the relationship between specific classes and the scheduling to the Mediator, which is a bit like the spring container. Let's look at the picture first:UnicomIn fact, delegate variables (parameter lists) and events execute methods in this form.This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,