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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.Wait, is this kind of drama familiar?The third is that due to the low sense of scene in online learning and the weak restriction on students, the completion rate of students may be relatively low.谁让你们当初烧了我军粮草的。Console.log (b.getName ()); //aa才能和才能相互碰撞的高尔夫女孩的故事。Summary: IoC and DI are actually descriptions of the same concept from different angles. Compared with IoC, DI clearly describes "the injected object depends on the IoC container configuration dependent object"