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作为汉军大元帅，韩信在巴蜀也呆了很长一段时间，对巴蜀的情势自然很是了解，不管怎么说张良还是没有亲自去过巴蜀，对那里的了解还是通过别人的。卫斯理和罗约翰到日本度假,偶遇正在协助日本警察 调查神秘凶杀案的白素。白素仍有心结,不肯接纳卫斯理, 要卫斯理离开日本。罗约翰却在机缘巧合下遇见了酷似自己初恋的女子无名。无名的神秘出现，使罗约翰处于爱与正义两难抉择中，而卫斯理和白素也因此卷入了新的风波......As a result, he only heard him recite the past and said coldly, "Other women can give birth, but you can't change diapers. You are the most melodramatic! "The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From BaiduAfter confirming, enter "java", "java-version" (java-version represents the version of java you installed) and javac respectively. If both run normally, it means java has been installed correctly.