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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可我就喜欢当地主收租啊……多谢父亲成全。超不幸体质的大学生福原幸多（曾田陵介饰）遇到了与自己完全相反的超幸运体质的筱宫直哉（佐藤友祐饰）。“只要和筱宫在一起，就不会发生不幸！”抱着这样的打算接近筱宫的幸多，因为一点误会二人作为恋人交往了。为了不让他人卷入自己的不幸，幸多一直伪装自己，与周围保持距离。然而从外表和内在都帅过头的直哉那里收到的甜言蜜语和温柔破坏力超群，幸多渐渐地不再是伪装的恋人了。The export default command specifies the default output of the module. Obviously, a module can only have one default output, so the export default command can only be used once. Therefore, there is no need to enlarge parentheses after the import command, because only one method can be corresponding.So many concepts, don't have a headache! Let's look at the relationship between the three methods with pseudo code!他可不能让她失望，要用尽全部心神，来争取这桩亲事。NotifyObservers ();