说明：  no intro
(object-oriented system design gradual book is an introduction of object-oriented software systems design, from the organizational structure is divided into two parts : the object-oriented concepts and an overview of UML, object-oriented system design. The first part is the foundation, the second part is the core. The book on the concept of object-oriented languages and UML is not on the face mask that Introduction of the book is basically need to use the part, all not suitable as a concept or object-oriented UML language reference manual.)