Answer :
Final answer:
In object-oriented programming, an 'activation' represented by a thin vertical rectangle on a sequence diagram denotes the period during which an object is performing a task or operation. It begins when a method is called, and it ends when the method finishes. This effectively reflects the sequence of interactions among objects.
Explanation:
In the realm of sequence diagrams in object-oriented programming, an activation, which is graphically depicted as a thin vertical rectangle, denotes a period during which an object is performing an operation or task. That is, it is used to represent when an object is active, or when a specific method of an object is in control.
Consider a scenario where object A calls a method in object B. This would illustrated on the sequence diagram by a horizontal arrow from A's lifeline to B's. Below the arrow on B's lifeline, we'd see our thin vertical rectangle, the activation, indicating that B is now executing that method.
The activation (rectangle) begins when a method is called, and it ends when the method completes. This helps in understanding the temporal ordering of interactions among objects within a system.
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