开闭原则是Java世界里最基础的设计原则，它指导我们如何建立一个稳定的、灵活的系统，先来看开闭原则的定义： Software entities like classes,modules and functions should be open for extension but closed for...
The Open-Closed Principle (OCP) - OO设计的开闭原则
Software entities (classes, modules, function, etc.) should be open for extension, but closed for modification.
软件实体（模块，类，方法等）应该对扩...
