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Example example=new Example ();1960年，中国登山队向珠峰发起冲刺，完成了世界首次北坡登顶这一不可能的任务。15 年后，方五洲和曲松林在气象学家徐缨的帮助下，带领李国梁、杨光等年轻队员再次挑战世界之巅。迎接他们的将是更加 严酷的现实，也是生与死的挑战......在温暖与残酷之间游走，在现实与理想间对决。哭泣者心有余温，狂奔者手捧玫瑰，感恩者上下求索——所有人都在寻找自己的对手。板栗已经红着眼睛杀了过来，前面根本无人敢挡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 Baidu"It's also our little Charlie's credit!"Condition 4 3546.1833