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Questions and Answers
What is the primary purpose of a sequence diagram?
What is the primary purpose of a sequence diagram?
- To depict the interactions between objects over time (correct)
- To model the internal structure of a class
- To represent the states of a system
- To design the user interface of a system
What type of arrow is used to represent a synchronous call in a sequence diagram?
What type of arrow is used to represent a synchronous call in a sequence diagram?
- Dashed arrow with a filled arrowhead
- Solid arrow with a filled arrowhead
- Solid arrow with an open arrowhead (correct)
- Dashed arrow with an open arrowhead
In a sequence diagram, what does a lifeline represent?
In a sequence diagram, what does a lifeline represent?
- An object's existence over time (correct)
- An object's state over time
- An object's attributes and methods
- An object's interactions with other objects
What is the purpose of an activation box in a sequence diagram?
What is the purpose of an activation box in a sequence diagram?
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In a sequence diagram, what does a self-call represent?
In a sequence diagram, what does a self-call represent?
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Study Notes
Sequence Diagrams
- The primary purpose of a sequence diagram is to show the interactions between objects over time.
Elements of a Sequence Diagram
- A filled arrowhead is used to represent a synchronous call in a sequence diagram.
- A lifeline in a sequence diagram represents an object's existence over time, including its creation, execution, and destruction.
- An activation box in a sequence diagram represents the duration of an object's activation, indicating when an object is performing an action or computation.
- A self-call in a sequence diagram represents a method calling itself, often used to show recursive behavior.
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