国产AV欧美AV亚韩AV完整版国语_国产AV欧美AV亚韩AV正片

The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu回到体育、时尚、太空、美食等重大现场活动的前七天，见证激动人心而又状况频出的幕后故事。俞大猷亲率20万浙兵，于赣、闽两省兵分六哨，展开地毯式清剿。正当大家为麻由华伤心的时候,鹫羽手持那粒红宝石,说可以满足大家的愿望.于是,在圣诞节时,沙沙美手中抱着一个可爱的女婴……所以尹旭的这个提议并不突兀，也是i在情理之中的。在一场调情游戏中，已婚咨询师和年轻的IT 技术人员互相给对方提出了质疑社会规范的挑战，结果却出人意料。