兰州大学信息科学与工程学院.ppt

Uses and Extends Use Case Relationships As the use cases are documented, other use case relationships may be discovered A uses relationship shows behavior that is common to one or more use cases An extends relationship shows optional behavior Actors An actor is someone or some thing that must interact with the system under development Use Case Diagram Use case diagrams are created to visualize the relationships between actors and use cases Uses and Extends Use Case Relationships As the use cases are documented, other use case relationships may be discovered A uses relationship shows behavior that is common to one or more use cases An extends relationship shows optional behavior Sequence Diagram A sequence diagram displays object interactions arranged in a time sequence Collaboration Diagram A collaboration diagram displays object interactions organized around objects and their links to one another History of the UML UML Supports Application Development Classes Operations The behavior of a class is represented by its operations Operations may be found by examining interaction diagrams Attributes The structure of a class is represented by its attributes Attributes may be found by examining class definitions, the problem requirements, and by applying domain knowledge Classes Finding Relationships Relationships are discovered by examining interaction diagrams If two objects must “talk” there must be a pathway for communication Relationships Multiplicity and Navigation Inheritance State Transition Diagram Component Diagram Deploying the System The deployment diagram shows the configuration of run-time processing elements and the software processes living on them The deployment diagram visualizes the distribution of components across the enterprise. Deployment Diagram What the Iterative Life Cycle Is Not It is not hacking It is not a playpen for developers It is not unpredictable It is not redesigning the same thing over and over until it is perfect It is not an ex