uml9种图模型（Uml9 diagram model）.docVIP

uml9种图模型（Uml9 diagram model） Nine model diagrams of UML Model diagram of 1. UML Figure UML model can be modeled system are one part of a graphical way to express different views through multiple different model of organic combination in certain aspects of the features can describe the system model. The model diagram of UML is composed of model elements, and the model elements express various concepts intuitively and visually in the form of icons. Some model elements can be used in multiple model diagrams, such as annotations and annotation connections, that can be used in any model diagram and used to annotate other model elements. The collection of model elements that can be used by various model diagrams is also different, and there are specific descriptions when describing various model diagrams. UML defines nine model diagrams: use case diagrams (Use, Case, View), class diagrams (Class, Diagram), and object diagrams (Object) Diagram), component diagrams (Component, Diagram), deployment diagrams (Deployment, Diagram), status diagrams (StateChart) Diagram), activity diagrams (Activity, Diagram), sequence diagrams (Sequence, Diagram), and collaboration diagrams (Collaboration) Diagram). The nine models have different emphases, such as use case diagram class diagram describes the needs of users, mainly describes the system implementation; the aspects described are not the same, such as class diagram describes the system structure, sequence diagram description is the behavior of the system; the level of abstraction is different, such as component diagram to describe the modular structure of the system. A higher abstraction level, class diagram is to describe the structure of specific module, the general level of abstraction, the object graph describes the specific module, a low abstraction level. In some books, the nine kinds of models are divided into three categories: structural classification, dynamic behavior and model management, structure classification includi