Questions tagged [uml]
The Unified Modeling Language is the industry standard for modeling software-intensive systems.
668 questions
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How to improve this class diagram of a system with its components
So I was given a task of making a class diagram for a bicycle. I know what a class diagram is and the concepts behind one.
The requirement is that the bike can brake, turn or speed up. Now to me, a ...
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Does it make sense for a package to depend on, e.g. import, its nested packages?
I think depending on nested packages is wrong, because the nested packages are always going to depend on the parent —aren't they?– and this can lead to cyclic dependency issues.
When I look at how ...
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Should exceptions be in the UML sequence diagram?
It the exceptions thrown in case of error are represented in the UML sequence diagram, would it make the UML sequence diagram too heavy?
If they are not represented, how to tell about them?
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Is it possible to omit things in the class diagram [closed]
I'm writing documentation for a school java project I'm working on. Basically have chunked most of the methods into the class diagram, but now it seems very unreadable on a pdf as the words are too ...
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What is the difference of swimlane and activity diagram?
Im trying to make an activity diagram , but i see that activity and swimlane diagram is almost the same, the only difference i see that swimlane diagram include many actor in it
i wonder about the ...
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Drawing UML activity diagram for Statistics feature
I need to draw a UML Activity diagram for a school java software engineering project I’m required to do. I’m quite new to this and I’m not sure what should be shown and what should not be shown. For ...
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is my UML use case and class diagram correct? [closed]
So I am very new to creating design diagrams. I have a scenario where a user who is an admin of pizza hut selects registration option and the system prompts them to enter customer details.
Upon ...
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Using UML State Machine for blockchain smart contract implementation
This is a conceptual question about applying UML State Machine model for smart contracts in blockchain.
I want to develop a smart contract framework in a bitcoin-like blockchain which is based on the ...
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How to model data flow between components in UML
I am trying to model a robot controller I am working on. If I would think in Object-oriented design, I would come up with a component diagram like this :
However, we use a data-oriented framework (ROS/...
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How to show relationship between member and the interface it implements in UML
I am building a class diagram where "Interface A" is implemented by a member of "Class B".
I don't know if I should even be drawing a relationship between these or if I should, what would the line ...
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Can we put a same usecase more than twice in 1 usecase diagram [closed]
There will be 4 roles, with 3 roles having a same use-case that is called view campaign and a use-case view segment.
Can we put a same use-case more than one time in the same use case diagram?
The ...
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initial and final state in activity diagram
As we know , initial state is the initial state of the system before the activity begins and the final state is the final state of the system when the activity ends. But what exactly is the initial ...
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When should i use an abstract class vs an interface? [duplicate]
I'm fairly new to programming. At school I am currently learning to program with Java. I want to build an application where i can store my collection of books, records, boardgames and such. Started ...
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Is it allowed to calculate the derived attributes by using other tables' attributes directly?
I tried to build a database for Driver Booking system. Here's brief details:
Drivers have several vehicles and they offers the driving service with them
Drivers will charge different hourly rates on ...
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Navigation in Class Diagram
I know that associations in class diagram can be bi-directional or directional. We refer to this as navigability. I am not sure to fully understand what it means.
Please consider the following ...
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Given an software example in MDE, would not the model always be a UML model?
I have just started learning about model-driven engineering.
But I have a hard time to grasp the different model levels, given software example. Would not the model always be represented in a UML ...
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How can I represent a Use Case Table Diagram when I have two user types capable of initiating it?
I have two users in my program, one's a Programmer and the other's an Administrator. The Administrator is capable of doing everything the Programmer can do, but also has some additional roles (such as ...
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How to show UML component load/discovery and realization relationships
In a UML component diagram I want to show two components (among others). One is the core component that loads contents (classes) from the other. It's much like a testframework loading unit tests/test ...
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Object and actors in sequence diagram [duplicate]
question
Can an actor "talk" directly with an object of the system in a sequence?
example
For an homework I need to model a "tracking service" for some shipping company.
The functional requisites ...
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Handle alternative frame in sequence diagram
Question
When an alt frame is used in a sequence diagram, and one of the two possibility end the sequence, how is "legal" to continue?
example
I need to represent a sequence in wich there ...
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Coherence between sequence diagram and class diagram
Question 1
All participants in a sequence diagram must match a class in class diagram?
Question 2
All class that represents some object that is created by the system needs a class that creates it?
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How to model system use cases realized by sub systems?
I found this question about sub systems & UseCases, just I lack understanding / mapping to my specific situation.
I want to model which sub component fulfills which UseCase realized by my system ...
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Tie together functional and physical architecture with UML2
I am new to UML and I have a best practices question. I would like to model separately:
logical architecture: logically interconnected software components;
physical architecture: physical ...
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Modelling 2 composition relationships between 2 XML elements using UML
I want to model an XML schema that has the following composition relationships:
A can contain B, and in another case B can contain A.
Using a bi-directional composition is not an option here as it is ...
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Class Diagram Alternative for Qualified Association
I am using PlantUML and it unfortunately does not support qualifiers on a class. I simply want to show in PlantUML that a Task has a qualified association to User through the Task.userID property.
A ...
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What's the use case of the combined fragment "strict"?
As far as I understood, synchronous messages will be handled one after another.
Then we have the interaction operator for combined fragments called "strict" which states, that the operands inside the ...
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Actor in Use Case diagram
I am learning about Use Case diagrams and UML. In a Use Case can actors be an external 3rd party system?
For example, in an ATM a user is an actor, but the SWIFT network system it communicates with ...
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Is my use case UML diagram too complicated?
The user of my app has access to two tools within my app. Each tool is comprised of multiple tables that the user has to fill with information.
The app is more complex but that's roughly what's it's ...
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Object Instance Diagram - What can be modeled?
According to my professor, one of the following relationships cannot be modeled in an object instance diagram:
Association
Composition
Generalization
I made the argument that the association could not ...
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Diagram to show how one object "becomes" another?
I am working in a purchasing system where we take calls:
public class Call
{
public List<CallItem> CallItems { get; set; }
}
The calls can be turned into quotes, where call items become ...
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How to merge object nodes in an activity diagram?
I have the following simple activity diagram:
My problem / question about is the last activity and its incoming object flows:
how to model proper UML here?
In UML-Spec 2.5.1 I find these quotes:
[15....
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How can we make a UML diagram (or something similar) for a project which doesn't contains classes (like non object oriented)?
I am working on a python project and I didn't use classes but created different modules and added functions in them.
Now I need to draw a diagram to describe the project/application for a paper. I ...
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UML class diagrams - how do I draw a class diagram that shows a self-reference? [closed]
So I have the following case. I have an interface A and an implementation AImpl. Now I have another implementation of A, called A2Impl, which references any instance of A besides implementing A ...
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What to do with data types with lots of connections in a UML class diagram
I have a Pose data type, consisting of x, y, and rotation values.
This being a robotics application, the Pose data type is used in about a dozen places throughout the application. Connecting all ...
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UML sequence diagram for a periodic operation
I have a scheduled operation in my spring boot application using spring boot scheduler.
this operation executes every period of time(30 minutes) and adds data in the database if conditions are met.
I ...
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Class diagram for electric guitar and bass
Hi I was recently asked this in an interview to represent a 6 string guitar and a 4 string bass in class structure. I am still new to software design and analysis so was not able to complete the ...
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Need to model properties on relations in UML. How is this done?
I have a datastructure that involves rating items, much like Netflix do. Now those ratings are numbers that are attached to relations between objects in a graph database. However, it seems as if ...
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Choice of appropriate UML diagram during Analysis phase [closed]
I am new to the formal idea of UML diagrams, but I have drawn and read system type diagrams for years. I wish to set a very simple exercise for the analysis stage of a project. I am considering the ...
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Can systems have only one use case?
I'm building a news aggregation system that collects news articles from several websites, then classifies them into categories, tags them with keywords and saves them to a database. All actions are ...
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UML - Overload operations with different parameters and a different return type
I would like to know if it is allowed in the UML to specify a different return type for overloaded operations. This is possible for methods in Java:
public class C
{
public int addOne(int a) {
...
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UML - Changing the visibility of operations when overriding them
I am trying to find out if it is allowed in the UML to change the visibility (access modifier) of an operation when overriding it. For example, in Java it is possible to increase the visibility of an ...
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Ternary association VS association class
I was wondering, are these 2 class diagrams equivalent EXCEPT the fact that in diagram A, a student doesn't have to have a study program?
The way I see it - for example in diagram B a study program ...
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When designing a system how could I describe the way sequence diagrams are related?
After the sequence diagram are made the sequence methods become code, before writing some code that would alter database records I would like to know how to detect if a sequence is doing the job ...
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Entity Relationship Model do I have to connect a table which is not using attributes from another table?
I tried creating an Entity-Relationship-Model, but I just don't get if I have to connect some tables and if I have to connect all, how do I connect tables which don't use attributes from another table....
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What are the differences and connections between UML Profile diagram & UML Class diagrams
I am doing research for developing a software platform and I have created some class diagrams for the platform. My supervisor adviced me to use UML profiles as well to describe the platform in a more ...
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Association in Use Case diagram have arrow?
I research about [association] in use case diagram :
It is a line has not arrow as image:
https://www.uml-diagrams.org/use-case-actor-association.html
But i using Rational Rose:
If i draw a [...
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Is "Dynamic Link Library" an actor?
I have a Software.
User will use software to process file,
But my software will use a other software or "Dynamic Link Library" of 3rd party.
Is "Dynamic Link Library" of 3rd party an actor?
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C# variables in Sequence diagram
I am playing with sequence diagram. And main question is how to draw properly on sequence diagram interaction with variable. How to draw
1) When MakePayment aggregates person
insurance....
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In a Conceptual class diagram, should Abstract Classes and arrowed lines be utilised?
Since we are just describing the problem domain rather than showing how the actual software will be designed, does that mean that we should not need abstract classes to show inheritance and arrowed ...
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How to model an association class in a UML class diagram where only one of the class has access to it?
Given this scenario: "Clinicians can record their own notes for each patient, viewable only by them." I would model it like this:
Clinician ----> Patient
and "Notes" as an association class ...
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