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ElevatorLiskov 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:亚父。Conforming to the explosive growth of China's cultural and tourism industry, "Charming China City? The" City Alliance "was formally established. The alliance brings together the participating cities of "Charming China City" to build a cooperative and shared platform for the development of cultural and tourism industries. Ha Xuesheng, director of the program department of CCTV's financial channel, Tang Lin, producer of CCTV's financial channel "Charming China City", and Mei Xiangrong, chief consultant of Pacific Century Tourism, awarded licenses to representatives of members, directors and executive directors of the City Alliance.当即沉声安慰道：外公，现在……多了我，我也是您的亲人，和子夜一起孝敬您老人家。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: