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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:D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:There have been written rumors that there were witches during the Sino-Vietnamese War? Or is it a miraculous thing like Dharma Master Dharma?爱奇艺与邵氏影业首次合作。国内首次以“保险理赔员”为视角，追查保险事故真相，集动作烧脑、悬疑推理于一身的虐心而又温情的行业故事。在人、妖、仙三界并存的平行世界中，一坛千年女儿红酒妖与酒坛子，分别化身成为妙龄少女酒九九和翩翩少年谭坛坛，将要飞升成仙。负责妖精升仙统筹工作的升仙管理局向二人下达任务：必须在一百天内找到人类中的一名符合条件的男子与酒九九完成结婚仪式，化解体内怨气，二人方可升仙。此人便是仙谭学苑的天年少年高冷，而高冷却是一个十分厌恶酒，并且对酒严重过敏的人。酒九九与谭坛坛混入学苑，第一天就误打误撞毁坏了仙潭男校的重要雕像，制造了一场巨大的混乱。一场相爱相杀的搞笑故事就此展开。