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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沈悯芮摇头道：不要多贵重，关键要有情谊，给他一个念想，男女交换信物的那种感觉，你要引蛇出洞，做戏就要做足。Recommendation Order因为烂尾、断更下了地狱，一代三流写手，竟然被打入了自己小说里面，重生为反派赘婿李雨果，和原小说的正牌男主角斗智斗勇，结缘众多红尘知己……穿书成反派赘婿的李雨果，后宫才刚营业，就被困于危机重重的黑森林之中，赘婿李雨果绝处逢生，与叶琼斗智斗勇，守护粉红佳人！然而五大家族却联手围攻天狼城，更大的危机潜伏而来，百年兽潮提前触发，世界毁灭的危机愈演愈烈，看李雨果携众人如何步步为营，扭转世界的毁灭，拯救大家！秦旷应了一声，亲自捧了茶给板栗。