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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"If the situation develops in this way, it is also to find the weakness of this" killer bee "? As long as we grasp our weaknesses and require our superiors to equip them with more flame throwers, will the situation be much better? Or can you use these 4 74 flamethrowers to attack these "killer bees" more effectively and hold the position more easily than this first encounter with "killer bees"? "I asked.Take bus No 31 to get off at Tianhou Palace Station.It is very simple. Press and hold the startup key and the home key in the startup state and wait for about 20 seconds, and the interface of recovery mode will appear (data cable is connected to itunes)郑昊，我问你，西边那些事可是你干的？众人闻言一愣，全都看着葫芦二人，神情十分奇怪。? Receives two parameters.