一木之道和一木大道

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　　正在泰国拍摄彭氏兄弟最新电影《B+侦探》的谭耀文，此次利用拍戏空档赶赴北京加盟港氏喜剧贺岁电影《财神到》的拍摄，片中汇聚香港众多资深笑匠也令谭耀文开心不已。小葱几乎立刻就感觉到哥哥的伤心和不舍，禁不住搂紧了他的脖子，将脸埋在他颈窝里，也流下了泪水。他才多大？葫芦沉默不语。其实，不仅大众对这部电影不关注，就算启明影视内部，对这部电影也不上心，觉得这部电影丝毫没有潜力，但是奈何陈启相当看重这部电影，启明影视也只能硬着头皮去宣传。故事发生在北平，叙述的是从1937年到1948年北平解放前夕两代人的生活经历。1937年，卢沟桥的炮声点燃了中华民族的抗日烽火，刚刚走出大学校的青年路童谣、赵大勇、吴霞等为挽救民族危亡和北平人民一齐投入抗日救亡的工作中。北平沦陷后，几个热血青年选择了不同的生活道路，童辛去了抗日前线；童谣结婚过着小日子；吴霞随家人到大后方避难。云首领，李斯乃是昔年的秦国丞相。