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Introduction to UML

Introduction to UML. Part 2 Behavioral Modeling. Sequence (event) diagram. Describes object interaction Typically captures behavior of a single use case Notation: message return . Sequence (event) diagram. object. message. lifeline. State diagram.

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Introduction to UML

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  1. Introduction to UML Part 2 Behavioral Modeling

  2. Sequence (event) diagram • Describes object interaction • Typically captures behavior of a single use case • Notation: • message • return

  3. Sequence (event) diagram object message lifeline

  4. State diagram • Describes all possible states of an object and activities associated with the state • How the state changes as a result of events that reach the object • States include start and end • States can be packaged into superstate

  5. State diagram Superstate Start state state activity transition

  6. Activity Diagram • Useful for describing behaviors with a lot of parallel processes • Parts: • start/end state • activities • synchronization bars • guards

  7. Activity Diagram guard Descision activity Synchronization bar activity

  8. Ideas to Take Away • UML is effective for modeling large, complex software systems • It is simple to learn for most developers, but provides advanced features for expert analysts, designers and architects • It can specify systems in an implementation-independent manner • 10-20% of the constructs are used 80-90% of the time • Structural modeling specifies a skeleton that can be refined and extended with additional structure and behavior • Use case modeling specifies the functional requirements of system in an object-oriented manner • Behavioral modeling captures interactions between objects, state transitions within objects, depicts flow of control.

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