本书是一本介绍面向对象软件系统设计的书，从组织结构上分为两大部分：面向对象的概念与UML概述、面向对象系统设计。第一部分是基础，第二部分是核心。-the book is an introduction of object-oriented software systems design, organizational structure is divided into two parts : Object-oriented concepts and outlines UML, object-oriented system design. The first part is the foundation, the second part is the core.