Sequence Diagrams in UML

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Questions and Answers

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?

  • 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?

  • 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?

<p>To highlight the duration of an operation (A)</p> Signup and view all the answers

In a sequence diagram, what does a self-call represent?

<p>An object calling its own method (D)</p> Signup and view all the answers

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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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