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After investigation, the office was already packed with people. It was dark, like the sky where a typhoon was coming.《谢文东 第二季》再掀江湖风云，看东哥如何愈战愈强，带领文东会登上江湖顶端……2.5Liskov 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:　　尹施允饰演陆东植，他是底层基金经理，作为证券公司的小职员就职，几年来一直负责各种杂务。性格很胆小也很心软，因此总是被人利用，他无法拒绝各种不合情理的要求，组长只有火气没地方撒的时候才会想起他来，他的同期同事都已经晋升，连刚进公司的菜鸟都看不起他。而他却从来没有生过气，是名副其实的烂好人里的烂好人。此时此刻，章邯的援军无疑是最大的希望，求援信已经送出去整整一天了，可章邯的援军还是没有到来。