Questions tagged [uml]

The Unified Modeling Language is the industry standard for modeling software-intensive systems.

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Is a mobile app's page a state in state diagram?

I'm currently creating uml diagrams for my bachelor's thesis on a project i worked on as an intern which comprehends a mobile app i wrote. What i was wondering is: in an UML state diagram, is an app's ...
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2answers
76 views

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 ...
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3answers
148 views

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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41 views

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: ...
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148 views

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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1answer
129 views

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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2answers
86 views

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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2answers
81 views

UML sequence diagram for a peridoc 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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4answers
170 views

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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1answer
38 views

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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1answer
43 views

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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4answers
134 views

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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1answer
48 views

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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1answer
97 views

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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1answer
66 views

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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1answer
30 views

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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1answer
31 views

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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1answer
30 views

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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2answers
78 views

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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2answers
137 views

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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1answer
83 views

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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1answer
40 views

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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1answer
61 views

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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2answers
74 views

Usage of composition relationship between two class in UML

I'm having quite a difficulty with what i think would suit a Patient class and a Record class in UML Basically the Record class stores the patient's information such as name, vitals, gender, age and ...
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2answers
138 views

How to model scenarios in UML class diagram?

I'm doing a conceptual class diagram for an app that lets: Clinicians view the patient's lab results and their calculated Reynolds Risk Score. Clinicians make changes to one or more of the patient’s ...
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1answer
79 views

Modeling “nested” interfaces in UML

I am modeling a system that exposes a number of "plugins" (not known at modeling time) through a web API. I have a number of "system" plugins that permit to interact with the system, something like "...
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3answers
173 views

Can there be different use case diagrams of the same system for different stakeholders?

Can there be different use case diagrams for the same system with differing levels of complexity? My question arises due to the fact that use case diagrams can represent a single system in a complex ...
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1answer
43 views

“Screen-states”: How to express all of them in a concise way? [closed]

If my software has some screens, how do i express the various states of those screens? If, for example, I have 3 checkboxes in a screen, so I have 8 combinations total and at first thought, 8 states ...
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2answers
202 views

UML - Identifying use cases and actors

I'm currently learning object-oriented programming and we have moved on to UML. We are learning about use cases and actors currently and we need to create a list of actors and use cases initiated by ...
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1answer
76 views

How to depict several sub-options in use case diagrams

Shown in the image below is an example of an actor that can perform an action and this action branches into several options (none of them HAVE to be performed). My question is whether the arrows ...
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1answer
185 views

Ordered vs sequence in association in UML

I am trying to understand UML class diagrams. Imagine two classes that are related with each other by association. What is the difference between {ordered} and {sequence} for the association?
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2answers
83 views

What does message means in UML sequence diagrams?

In UML sequence diagrams, given two objects A and B, if Object A sends a message to Object B. Does this mean the message is a method in Object B which is invoked from Object A?
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2answers
86 views

Composition - legal class diagram

I wanted to ask if this is a valid class diagram: I tend to think not, because it forces a certain wheel to belong to two vehicles at the same time (because of the 1 multiplicity). If the ...
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1answer
65 views

method taking a class parameter

I have recently begun studying UML. All is going fine so far until I saw the following: This is a class Called Point2D It has 2 attributes which are x, type float and y, type float. It has 3 methods ...
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2answers
239 views

How to model attribute dependency “inside one class” in UML class diagram?

I have the following "software reality in working code" (also no access to it): There is a class Class1 with different attributes AttributeA - sums up all "ordinary attributes" EnumType DataType ...
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1answer
70 views

requirements model and UML

I need to create requirements model for my software(first step of software engineering), But I don't know which icon of UML can help me to implement requirements model.
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2answers
183 views

Is it possible to represent an if statement in a system sequence diagram?

I'd like to highlight that this questions is about a System Sequence Diagram (SSD) and not a simple Sequence Diagram and of course any help would be appreciated! I'm reading Graig Larman's book ...
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1answer
111 views

How to convert a use case to a use case diagram?

Suppose I have a use case, like this example. Normal Flow: The user will indicate that she wants to order the items that have already been selected. The system will present the billing and shipping ...
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2answers
67 views

Detecting UML usecase correctly

UML Diagrams says: A use case is a kind of behaviored classifier that specifies a [complete] unit of [useful] functionality performed by [one or more] subjects to which the use case applies in ...
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1answer
183 views

Problem in creating a correct finite-state-machine for a given short text

I like to create a finite-state machine for the given text below. While solving this, I came accross with several problems I listed at the bottom. (This example is in terms of testing (where you later ...
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1answer
76 views

How this diagram can be improved [closed]

I'm looking for failures in this "token based login" design, besides the UML "syntax" errors. Theoretically speaking, it will do the trick when implemented on an small project. If true, sorry about ...
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3answers
67 views

UML dependency in a UML deployment diagram with two arrow heads

Can I draw mutual dependencies between two artifacts in a deployment diagram as a dashed line with two arrow heads? Or is this a no-go in UML?
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2answers
80 views

Problem in modelling this because too slow calculation (robot football)

I like to build a component connector view / UML diagram for the given problem but I realized it's way too slow if you try to do it exactly as it's given in the following text. My question is what ...
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2answers
76 views

If a user delivers a file as input for a use case, what is the actor : the user or the file

Our call center collects requests from customer, which are processed by back office. Much of the requests are passed in spreadsheets by type of request. In view of automating some work of back office, ...
4
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1answer
469 views

How do you correctly turn this text into an activity diagram (problem with timer)?

This is only an extract from a very long text, the one I'm not sure about. It's about a photo booth (an automata that makes a picture of you if you insert coin). The automata has a camera that is ...
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2answers
448 views

Which SOLID principles are broken by this class diagram?

I just read about all the 5 principles S,O,L,I,D and I like test it in little example if I understand them correct. Which SOLID principles are hurt by this class diagram? I think what is broken is ...
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5answers
401 views

Design pattern for creating object hidden from client

I am having difficulty understanding which design pattern would be best for the following scenario. An application uses a database. That database can either be the production version (SQL) or a test ...
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0answers
43 views

UML how to model parallel activity with runtime-dependent number of participants

I want to model an activity that involves processing several items in parallel. So to speak, I want to find a Activity Diagram representation for something like the following snippet / pseudocode: ...
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1answer
237 views

Trying to understand Sequence Diagram

I am trying to understand two sequence diagrams that I have found in the SE course at university of Washington. Can you confirm if my understanding is correct ? Diagram 1: According to my ...
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1answer
153 views

How to manually model a UML activity Diagram to JSON with Qt C++?

Suppose I have a kind of UML activity diagram with 1-n forks and joins. The assignment of the individual nodes relative to each other is defined by an XML relationship table via UUIDs where each ...