Questions tagged [class-diagram]
A class diagram describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among the classes.
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1answer
500 views
Why does the Square–Rectangle problem violate SOLID principles?
My previous question was just with class diagram and because of some comments I thought I try to find an example with a little piece of code for the diagram to see if principles correct understood?
...
1
vote
2answers
366 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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2answers
62 views
When converting the ER into the class diagram, what happened to the Weak Entities in the ER diagram
I am trying to convert an ER diagram into a class diagram. Below image is showing that part of my ER diagram and which contains a weak entity call 'Parent'. Therefore when we consider the ER diagram, ...
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0answers
111 views
UML Class Diagram HashMap with different Key datatype using Qualified Association
By using the qualified association element of UML Class Diagram, we can create HashMap as the datatype of one of our class attributes (see here). In my case, I have to use HashMap with different key ...
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1answer
827 views
UML Class Diagram HashMap Data Type
How can I show a Java HashMap data type in UML Class Diagram (or C# dictionary)?
I.E. This class:
public class Test
{
private Map<String, String> map;
private Map<String, int> ...
1
vote
1answer
402 views
UML Class Diagram with reference data type
For the following UML Class diagram, I have a reference data type Nurse, and I am using it in Hospital Class, is it needed all the time to describe the reference data types in UML Class diagram? Is ...
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1answer
359 views
UML Class Diagram for python flask application
I have developed a web-application using python's Flask framework and MySQL for my software engineering project assignment. My Instructor asked us to submit UML diagrams for the Project, I was able to ...
3
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1answer
143 views
Can you place elements other than classes in a class diagram [closed]
I'm currently doing up class diagrams for a project I'm working on. I feel there's something that should be represented in my class diagram but I'm not quite sure.
I have a .csv file which the ...
1
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1answer
96 views
Role design pattern in uml
In my UML class diagram, I have an interface called Contract which a Staff implements. There are two types of Staffs: one is partTime and the other is fullTime.
Does that mean that the two partTime ...
0
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1answer
126 views
Class Diagram for Train-Wagon Senario
I have doubts on approaching doing this.
I have a Train class and a Wagon class. There are three types of wagon: FirstClass, TouristClass and DiningCar. Each of these types has the same properties ...
0
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0answers
225 views
Is implementing anytime it makes sense aggregation and composition necessary good?
As I'm drawing my project's classes diagram, I'm wondering...
Let's take Customer's relationship with Order for example.
It seems pretty natural and logic to aggregate Orders to the User... So ...
2
votes
4answers
457 views
Is actor a own class
I have this sequence diagram and want to transform it into a class diagram.
But I don't know if the actor (Customer) is in this case a own class or not. Normally the actor isn't a own class, but in ...
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4answers
5k views
How to represent constants in UML class diagram?
I am working on developing a UML class diagram from C++ code. I have a classless header file that is basically a definitions file (it has structs, enums and defined constants). I know how to ...
3
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2answers
199 views
Should I show the association class in my class diagram?
For example I have a relationship like this:
user (0..*) buys product (0..*)
Which results in an association class, called sale, which has the userID and productID. Just for the question's sake, ...
4
votes
3answers
2k views
UML Class Diagram: How to describe method functionality?
Recently, we have learned about UML class diagrams in university and I began applying that knowledge to my work projects.
However, I am still unsure how or where I am supposed to describe the ...
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1answer
410 views
Should I make a separate class diagram for the administration part of my software?
I am building a software which has two types of users in it: main users and admins.
I am still building the class diagram for this system. For the main user's relations I have things like: user ...
3
votes
1answer
5k views
How to model user management using UML class diagram?
I have school project where me and my team have to build a health care system. It consists of different modules including :
A module for doctors : It allows a doctor to access the medical records of ...
4
votes
1answer
806 views
Association + multiplicity vs aggregation and composition?
I know the differences between these associations (as described here). However I'm wondering:
Composition, why not simply use an association with multiplicity of 1..* (and thus implicit saying that ...
3
votes
3answers
141 views
Can a parent class not have attributes or functions?
I have 3 Different Classes Which are representing different types of Sensors, for example:
WaterLevelSensor
DoorSensor
TemperatureSensor
Each Class has different functionality.
Following the OOD ...
2
votes
2answers
105 views
When creating a UML class diagram, should I know which programming language will be used to develop the application?
I had to develop an application in Java for a school project, so I designed a UML class diagram oriented towards Java (including structures, attributes and types). For example:
-getLists() : List<...
1
vote
1answer
295 views
Doubt about representing a Shopping Cart in Class Diagram/ER Database implicating ORM
I have to do a task which is reading a text, and create a Class diagram. One of the entities is a Shopping Cart.
My doubt is how to represent a Shopping Cart in a class diagram, later on an E/R ...
4
votes
2answers
1k views
How should libraries be shown in UML class diagram?
Maybe the title isn't that clear so I will explain this a little bit further. I use biojava to perform BLAST searches. However this BLAST.jar contains a lot of classes:
org/biojava/bio/program/...
9
votes
3answers
4k views
Software architecture vs System architecture vs Class diagrams?
I'm quite confused about the following terms:
Software architecture
Software application architecture is the process of defining a
structured solution that meets all of the technical and ...
-3
votes
1answer
953 views
Turn based game class design
I wrote abstract base for some turn-based games (like chess or tic-tac-toe) and wrote game based on this base. And I stuck with choosing how to design class hierarchy. Here is two variants for wich I ...
4
votes
1answer
370 views
Class Diagram - Inheritance Relationship
If in class diagram I have a parent "Account" and three childs "Child1", "Child2", and "Admin". The "Admin" has control over "Child1" and "Child2" accounts. Will the relation be like this?
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votes
3answers
2k views
How to translate a class diagram to code?
During the design stage, I usually come up with a class diagram that looks something like this
However, during coding stage, I would never create a class like Librarian with issueStatus() or ...
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0answers
290 views
Understand the service term in DDD and matching class diagram
I m trying to learn how to make my code better. This way, I try to learn some books and understand them.
I m having some troubles dealing with Domain Objects. From the first year of my IT school, I'...
1
vote
1answer
2k views
How to represent two way composition between two classes in UML class diagram
If class A has many of class B and class B has many of class A, should we place a diamond on both sides of the line between them?
Like in the picture below, or is it fine to just indicate the amount ...
1
vote
1answer
335 views
How does maven internally manage package dependency?
Can some let me know how does maven internally manages package dependency? Is there any architecture diagram available on the net for the same? I also asked this in Quora and maven user mailing list ...
1
vote
0answers
230 views
Shared pointers across threads in UML for class and sequence diagrams
How does one represent shared pointers across threads in UML for class diagrams and sequence diagrams?
I especially want to document the ownership of the memory even though it's accessibility (a ...
0
votes
0answers
262 views
UML Class Diagram for Simple Trip System
I need to design a simple trip class diagram capturing the following details. I'm not an expert in modeling so I just wanted to ask if the model is approriate. It should capture following details:
A ...
2
votes
3answers
910 views
How to represent the following scenario in a class diagram?
Consider a store with multiple branches and a system generates reports for each branch monthly and annually and an overall report as well monthly and annually.
So in total there are 4 types of ...
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votes
2answers
1k views
How to improve this UML class diagram?
How can I improve this UML class diagram?
I'm really confused about the relationship between Expense and Category, because Category and Expense can exist by themselves: you can register Expense and ...
2
votes
1answer
909 views
Class diagrams and frames
UML class diagrams (1st pic) and frames (which belong to knowledge representation and artificial intelligence) (2nd pic) look pretty alike. But do class diagrams exactly type of frames or they just ...
1
vote
1answer
1k views
Visibility notation in UML class diagrams
I'm reading about UML class diagrams and notation for visibility, and I can't tell if this book (Learning UML 2.0 by Russ Miles) has a typo or is just not explaining itself.
Consider these two ...
4
votes
1answer
2k views
How to correctly draw a UML class diagram with fully qualified association?
Given the following code I have to draw the corresponding class diagram:
public class Shop
{
List<Client> clients;
Storage store;
User chief;
Set<Invoice> invoices;
}
...
3
votes
1answer
608 views
Why do you reduce multiple inheritance to the diamond problem?
Whenever I read something like this:
Many programmers exhibit a slight, involuntary shudder whenever
multiple inheritance is mentioned. Ask them to identify the source of
their unease and they ...
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votes
1answer
358 views
What is the UML idiom for classes that are too big to fit into one box? [duplicate]
I am documenting an existing system using UML 2, and a few of the classes are too big to comfortably fit into a single class box.
So far, I've resorted to breaking up the class into multiple boxes ...
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2answers
348 views
What kind of design diagram is this?
Here is a kata for the Bowling Game problem. Slide 9 (below) shows a design diagram. But its not obvious to me which box is a class and which is a property or method from the makeup of the boxes ...
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1answer
1k views
Multiplicities and ternary relations in UML and ER
With entity–relationship diagrams, there are two conventions of denoting multiplicities, (I) and (II):
Say, a teacher T is giving ‹G› some lectures L. Then we can either write this as
1 ...
2
votes
3answers
2k views
How do I show 'creates' in a UML class diagram?
Let's say my code is going to look like this:
public class MyController
{
private Foo foo;
private FooGenerator fooGen;
//setters
public void work()
{
this.foo = this....
1
vote
1answer
801 views
UML diagram for attributes that can have two different types
I have been to an interview for a financial programming job, and I could not answer to one question for sure. I thought about it again, but I really cannot find a good answer.
They asked me to design ...
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2answers
669 views
Can a UML class diagram show two different relationships between two classes?
I have a class which has an inner (nested) class. I have shown this relationship between the two classes in my class diagram. However, I am also using the inner class within the outer class... do I ...
1
vote
1answer
354 views
How to show link between a java class which gets JSON data from PHP script
I am trying to show the relationship that a java class has with a PHP script. The PHP script gets data from a database and then converts it into JSON format. This is then read by the java file.
In my ...
2
votes
1answer
4k views
How can attributes/annotations be illustrated on a UML class diagram?
Many programming languages offer a way to annotate types.
For instance, in .NET this can be achieved by deriving a custom attribute class from System.Attribute and then annotating another type with ...
1
vote
1answer
345 views
Inheritance vs Class Diagram [closed]
What is the difference between an inheritance diagram and a class diagram in UML? For the Computer Science A Level (a British test administrated by Cambridge University, so it's possible that this ...
1
vote
1answer
2k views
How to represent a multiple choice attribute in UML class diagram?
I'm modelling a Filter class that stores the options for filtering a search. Some of the attributes are multiple choice.
For example, if you are filtering hotel rooms you have a Price attribute that ...
2
votes
2answers
1k views
Confusion about associations in UML class diagram
--------------------- ----------------------
| FLIGHT | | STEWARD |
--------------------- ----------------------
| Arrival time | | Steward ID |
| ...
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2answers
258 views
My class diagram needs to model a relationship with varying quantities
I am trying to design a restaurant ordering system in UML, which should also include the stock system.
One of the classes is a Dish (i.e. a dish on the menu), and another is an Ingredient.
My ...
2
votes
1answer
580 views
How to manage coupling in model classes
I'm doing a class diagram for a game project, but I'm stuck on a coupling problem.
Context
The projet is a turn-based game. Two users are playing. They've got units on a map. They play until 1 ...
