uml各种图例及说明(摘录)(国外英文资料).doc

uml各种图例及说明(摘录)(国外英文资料) UML various illustrations and descriptions (excerpts) 1, use case diagram Describes the connection between roles and roles and use cases. It shows who wants to use the system and what they can do with it. A use case diagram contains multiple model elements, such as systems, participants, and use cases, and shows various relationships among these elements, such as generalization, association, and dependency. 2, class diagram Class diagrams are static views that describe classes in a system, and relationships among classes. It allows us to have a comprehensive understanding of the system before writing the code properly. A class diagram is a type of model, or rather a static model type. 3 object graph Very similar to class diagrams, which are instances of class diagrams, which display multiple object instances of the class, rather than the actual class. It describes not the relationships between classes, but the relationships between objects. 4, activity diagram Describes the activities required by the use case, as well as the constraint relationship between activities, which facilitates the identification of concurrent activities. The ability to demonstrate where the functionality exists in the system, and how these functions and other components of the system work together to meet the business requirements of the previous use case diagram modeling. 5, status diagram Describes the object of the class, all possible states, and the transfer condition of the event. The lifetime of objects, subsystems, and systems can be captured. They can tell how an object can have, and how events (such as message reception, time passing, errors, conditions, and so on) can affect these states over time. A state diagram should be connected to all have a clear identifiable state and complex behavior; the graph can determine the type of behavior, and the behavior according to the change of state current, also can show the object what events will change the state of