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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.Compared with standard, top-of-stack reuse can effectively reduce the consumption of resources by activity repeated creation, but this depends on the specific situation and cannot be generalized.Lawyer Yi talked about a case he had done:不过想想也对，笑傲江湖这四个字现在已经热到没边，《笑傲江湖》游戏现在不上市，更待何时？大家用脚趾头想，也能知道，《笑傲江湖》游戏上市后，肯定会立刻风靡起来。(3) "Many-to-Many" (MvM)妻子死后，半泽（佐野史郎饰）十分失落，加上在工作上屡屡出错，他几乎丧失了生活的信心。某日，半泽来到了一个叫“爱妻屋”的商店，在这里他竟然看到了和妻子长得一模一样的机器人。而一起的韩王成则犹豫了，想起和尹旭的交情不错，以及尹将军在盱、眙和彭城的表现，他感觉还是不要招惹的好，于是这个重任自然而然地落到了魏王豹一个人头上。