billzhangmingming的专栏

一、UML简介UML（Unified Modeling Language）即统一建模语言，是OMG（Object Management Group）发表的图标式软件设计语言。UML的功能：可视化、说明、建造、建文档UML包括：              用例图（Use case diagrams）              类图（Class diagrams）     

 When is a singleton not a singleton? Avoid multiple singleton instances by keeping these tips in mind  Purposely reloaded singleton classes Classes are reloaded not only after class garbage