开闭原则(Open Close Principle)： Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification. 软件对象（类、模块、方法等）应该对于扩展是开放的...
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...
