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UnicomThe 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 BaiduFor many years, it is worth collecting.DC动画电影《自杀小队：严厉惩罚》(Suicide Squad: Hell to Pay)发布预告，小丑女、死射、冰霜杀手、铜头蛇、回旋镖队长、铜虎组成小队，阿曼达·沃勒派遣他们去找回一个神秘物件——为此他们愿意牺牲性命，而小队很快发现他们面临着其他团伙的挑战。克里斯汀·史莱特、C·托马斯·豪威尔、塔拉·斯特朗、连姆·麦肯泰尔、比利·布朗、克里斯汀·鲍尔、凡妮莎·威廉姆斯、丹妮亚·拉米雷兹等参与配音，Sam Liu(《蝙蝠侠：致命玩笑》《绿灯侠》动画系列)执导，今春发行数字版、DVD和蓝光碟。1. Incident Profile