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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.Dr Eric Cole, a cyber security expert, told Futuristic Technology magazine: "The first and most important point is to realize that this is a real threat and may happen." Cole added that for laymen, the best defense is to know where your information is stored electronically and to back up any important information locally. Even if cloud storage is often touted as a more secure network service, it will not be immune to targeted attacks that destroy supporting infrastructure or maintain the power grid of the framework.For example, Tmall 618 opened the coupon collection and preheating online. When Osaka Weaving House transplanted it to offline stores, it cut the activity into six promotion bands with different themes, specifying the promotion time and purpose, and avoiding the rush of shopping guides. In each band, for different types of users, sales skills are set separately to improve the success rate of shopping guide.他毫不怀疑妹妹的话，她是大夫，这么说肯定有她的道理。　　能承受什麽？更何况小说这么多。