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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:赵文华这一喘相当傲娇，也不下轿子。吕馨坐在桌前，手托着脸颊，眼睛定定的看着陈启。A box selects the entire graphic and uses the Tianzheng command: Eliminate heavy lines (command: XCCX)进城打工的王大春长得英俊潇洒，父亲英年早逝，母亲守寡一生，将其拉扯长大。王大春长的像父亲，而母亲则很丑，所以王大春从小就很怕别人知道他有一个丑娘。王大春打工时与同在一个酒店打工的漂亮城里姑娘赵小旭相识后，由于已父母双亡的赵小旭特别注重男友及其家人的相貌，再加上王大春对赵小旭特别细心的呵护，两个人相恋了，深爱赵小旭的王大春因为虚荣心和因为有个丑娘而几次被女友抛弃的经历，使他向赵小旭隐瞒了自己的家中有丑娘的事实，说他自己也是父母双亡……The following are some issues that everyone is concerned about. The handle, as shown in the following figure, has always been the interface between the interface and the Wii's handle interface.我再慢慢劝劝，不定她哪天就转过弯来了。