Modeling Dynamic Behavior
Use cases and scenarios provide a way to describe system behavior; that is, the interaction between objects in the system. Sometimes it is necessary to look at the behavior inside an object. A statechart diagram shows the states of a single object, the events or messages that cause a transition from one state to another, and the actions that result from a state change.
A statechart diagram will not be created for every class in the system, only for classes with “significant” dynamic behavior. Interaction diagrams can be studied to determine the dynamic objects in the system—ones receiving and sending many messages. Statechart diagrams are also useful to investigate the behavior of an aggregate “whole” class and of control ...
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