When drawing a sequence diagram, the analyst uses lifelines and a symbol to represent the execution occurrence. It is also possible for an object to be destroyed at some point in time. Explain these three concepts – what is a lifeline, what does the execution occurrence mean, and how it is possible that an object can be destroyed in a use case.
Nov 25, 2019 · B. One. Hi student! The context diagram is the most abstract data flow representation of a system. It represents the entire system as a single bubble. This bubble is labeled according to the main function of the system. So the answer is B. One. Hope this helps!
Oct 22, 2021 · Interaction Diagram is a combined term for a) Sequence Diagram + Collaboration Diagram b) Activity Diagram + State Chart Diagram c) Deployment Diagram + Collaboration Diagram d) None of the mentioned Answer: a-----7. Structure diagrams emphasize the things that must be present in the system being modeled.
Feb 23, 2021 · a) Realization b) Generalization c) Aggregation d) Dependency SOLUTION Answer: b Explanation: The generalization relationship is also known as the inheritance relationship. In the figure Square is the subclass of superclass shape. 5. Which diagram in UML shows a complete or partial view of the structure of a modeled system at a specific time? a) Sequence Diagram b) …
Symbol and Components of a UML Sequence DiagramLifeline. Lifelines in a UML Structure diagram are used to represent each instance in interaction.Actor. ... Activity. ... State. ... Object Flow. ... Bars. ... Initial State. ... Control Flow.More items...
In the UML, an object in a sequence diagram is drawn as a rectangle containing the name of the object, underlined. An object can be named in one of three ways: the object name, the object name and its class, or just the class name (anonymous object). The three ways of naming an object are shown in Figure below.
Repeated interaction When a message is prefixed with an asterisk (the '*'-symbol), it means that the message is sent repeatedly. A guard indicates the condition that determines whether or not the message should be sent (again).Jun 7, 2008
alt is used to describe alternative scenarios of a workflow. Only one of the options will be executed. opt is used to describe optional step in workflow. For example, for online shop purchase sequence diagram you may use opt to describe how user can add gift wrapping if she wishes.
reply messagesSolid arrow heads represent synchronous calls, open arrow heads represent asynchronous messages, and dashed lines represent reply messages. If a caller sends a synchronous message, it must wait until the message is done, such as invoking a subroutine.
Action or Activity State – An activity represents execution of an action on objects or by objects. We represent an activity using a rectangle with rounded corners. Basically any action or event that takes place is represented using an activity.Feb 13, 2018
A sequence diagram is a type of interaction diagram because it describes how—and in what order—a group of objects works together. These diagrams are used by software developers and business professionals to understand requirements for a new system or to document an existing process.
An alternative combined fragment is used to specify an area of a group of lifelines/ actors to show conditional flow in a sequence diagram. It also models the if-then-else logic in the sequence diagram.Jul 14, 2010
A fragment in a sequence diagram is a rectangular frame drawn over part of the diagram. They represent conditional structures that affect the flow of messages. These frames are known as combined fragments in the UML specification and the container is known as the interaction operand.Aug 31, 2021
The alternative combination fragment is used when a choice needs to be made between two or more message sequences. It models the “if then else” logic. The alternative fragment is represented by a large rectangle or a frame; it is specified by mentioning 'alt' inside the frame's name box (a.k.a. fragment operator).Mar 31, 2022