成人教育av

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我已经不成了，您快走了吧。Big handprint: the enemy's 100 evil points, total damage * (1 +0.5), but the four heavenly kings' evil value is 30, the roving bandits' evil value is 30, and finally the landlord's evil value is 0.掌上明珠何曾受过这等委屈，联姻的事情可以稍后，必须得先让他散散心才好。A5.1. 3.3 Drainage examination in lower head position.所以此人会是羽儿你的心腹大患，必须尽早铲除，不得迟疑。