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This is it for the time being. Let me have some experience.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:8. Riverside ParkIn men, this aspect is often more prominent, consciously or subconsciously do not want to be regarded as helpless or in need of help-it can be said that the real "face-saving".去了学里，板栗跟夫子告假。《灯下罗曼史》因为离得近而看不见对方，对于终于要面对的那一刻，在爱情和友情之间我们会是什么样子呢？大概说明情由后，御史和几位朝臣就劝秦枫顾全大局，不可蔑视天威，肃王也恳请皇叔成全孙女的姻缘。