OOADġ1 Objects/Classes activation lifeline Client ATMMachine SavingAccount Activation: the time period during which an object performs an operation. Messages: means by which objects communicate with each other. Lifeline: the time during which an object exists. Objects: represented by boxes at top of diagram. Messages are passed between objects, and may contain parameters (e.g., message name (parameter list))ĩ Sequence Diagrams Describing the behavior of a system by viewing the interaction between the system and its environment Shows the objects participating in the interaction by their life lines and the messages they exchange Shows an interaction arranged in a time sequence OOAD OOADĨ Messages are passed between objects, and may contain parameters (e. To see a particular behavior over many use cases or threads use an activity diagrams. If you want to see what a specific object is doing for several use cases use a state diagram. Interaction diagrams do not give a in depth representation of the behavior. They demonstrate how the objects collaborate for the behavior. Interaction diagrams are used when you want to model the behavior of several objects in a use case. Objects are created and destroyed Objects send messages to one another External events trigger operations on certain objects Objects have states that would be difficult to capture in a static model OOADīehavior diagrams (dynamic): Interaction diagrams Sequence diagrams Collaboration diagrams Statechart diagrams Activity diagrams OOAD Chapter 8 Appendix © 2008 by Prentice Hall 2 2ģ UML Dynamic Modeling In all systems, events happen dynamically, e.g.: Understand how to represent system logic with state machine diagram. Understand how to represent system logic with activity diagram. Modeling Behavior Interaction Diagrams Activity Diagram State Machine Diagram OOADĢ Learning Objectives Understand how to represent system logic with interaction diagrams. 1 Interaction Diagrams Activity Diagram State Machine Diagram

Activity diagram of atm