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Understanding UML Behavioral Modeling: Sequence and Activity Diagrams

This section explores UML's behavioral modeling, focusing on sequence diagrams and state diagrams. Sequence diagrams describe object interactions and capture the behavior of single use cases using messages and lifelines. State diagrams detail the possible states of an object and associated activities, illustrating how states change due to events. Activity diagrams help depict behaviors with parallel processes using elements like start/end states and synchronization bars. Learn how UML effectively models complex software systems while being accessible for developers and powerful for analysts.

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Understanding UML Behavioral Modeling: Sequence and Activity Diagrams

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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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