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.
-2
votes
1answer
39 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?
0
votes
2answers
77 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 ...
0
votes
2answers
104 views
2 way multiplicity constraints in code
my goal is to convert this class diagram into Java code.
How should I approach this, given that I want the constraints to hold at all times? It creates a chicken-egg problem where the first Course or ...
1
vote
2answers
123 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
...
0
votes
2answers
98 views
Convert UML Class to Java Class
Suppose I have 3 UML Class diagrams. One is University, other is College, the other is Department. Each University can have multiple colleges, each college multiple departments. I have the UML class ...
0
votes
1answer
545 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
387 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 ...
1
vote
2answers
101 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, ...
1
vote
0answers
143 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 ...
-3
votes
1answer
1k 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
667 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 ...
3
votes
1answer
172 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
vote
1answer
102 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
votes
1answer
134 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 ...
2
votes
4answers
505 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 ...
5
votes
4answers
6k 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
votes
2answers
213 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 ...
0
votes
1answer
439 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
840 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
145 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
109 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
307 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/...
10
votes
3answers
5k 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
1k 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
403 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?
4
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 ...
2
votes
0answers
311 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
339 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
240 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 ...
2
votes
3answers
931 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 ...
4
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
960 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
2k 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
647 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 ...
0
votes
1answer
370 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 ...
0
votes
2answers
352 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 ...
0
votes
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
827 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 ...
1
vote
2answers
693 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
362 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
358 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 |
| ...
