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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.出了门口，两位军人见副千户点头，这才散了不再追究。Before SSL data transmission, both communication parties need to shake hands with SSL, negotiate encryption algorithm to exchange encryption keys, and carry out identity verification. Usually such SSL only needs one time, but there is a Renegotiation option in SSL protocol, through which the secret key can be renegotiated to establish a new secret key.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.“三言二拍”是明代著名的拟话本系列，其在文学界的地位堪与《金瓶梅》相媲美，并且它和《金瓶梅》一样，由于其中的色情描写，长期被统治者列为禁书。“三言二拍”中许多著名故事，在影视界久演不衰，成为经典的体裁系列之一。新世纪之初，几大影视公司联手投入巨资，共同推出这套全剧版“三言二拍”。偏偏他就喜欢她这样。CalculateBouns function lacks elasticity. If there is still a D level, then we need to add an if statement to judge the D level in the CalateBouns function.