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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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Imagine I got user which might be either author, administrator, reviewer An author have relation on book that he wrote. An administrator have relation on banned user (we track which administrator ...
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If I create a sequence diagram for a use case, should the objects in the sequence diagram be based on the methods and classes in the class diagram, or is that not necessarily required?
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I am creating a cinema website focused on client services, where clients can reserve tickets for movies and browse the cinema's schedule (both daily and weekly). The schedules will be managed by an ...
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I want model something in class diagram. sometime it seems you can use association or just operation. for example User and Product, should they have association with name Add or should class User have ...
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Background Working towards my final project at University, team project and we're stuck with a disagreement on a point in our Class Diagram. We have a class, called "Road". In here with have ...
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So I have a security model and am having problem with deciding the cardinality. This is what I have now: Threat may result in Attack. Direct Association One-to-Many (0..*) Attack exploits ...
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Is it possible to have an association without explicitly indicating the reference attributes in the participating classes in the UML class diagram? For example, consider this example : We can see ...
Ahmed Mohamed's user avatar
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When domain modelling, should a valid constraint - or "natural" constraint - be modelled, even if there are no current business processes which rely on the constraint being asserted. As an ...
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I'm building a ToDo list while practicing in different patterns and adding more complexity to the project. The problem which I'm currently facing is to how to apply (and later use, validate and ...
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there are a vehicle class and customer class . In short, in the customer class there is a function that shows 'can this person or company rent that car'.The function uses a object of vehicle and ...
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Suppose I have the following client code: using System; namespace InterfaceCompositionUml { internal class Program { static void Main(string[] args) { ...
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Could someone explain to me if the relation in this class diagram is a "dependency" or "association" relationship and why? I cannot edit the picture. The terms translate into ...
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I've built a matchmaking system where two of the classes look like this: I know that it actually looks like an inheritance, but in the code it doesn't extend to the PlayerInMatchmaking and the ...
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In the Design Patterns: Elements of Reusable Object Oriented Software, the Gang of Four present the following canonical form for the Builder pattern: In Appendix B the following is mentioned ...
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Problem statement: The information system of a university must manage information relating to its employees, departments, institutes, courses provided, and research projects. Information relating to ...
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I'm making a class diagram for my school project, an Inventory Management System. So far, I've made the use-case and activity diagrams, however, I'm struggling with the class diagram and mostly ...
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In a Microsoft Learn article on MVVM there is an, what I assume, UML diagram that didn't make sense to me. (https://learn.microsoft.com/en-us/archive/msdn-magazine/2009/february/patterns-wpf-apps-with-...
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I have an index file that uses three main JS classes each defining one method. The JS application is about listing a folder datasets, deleting a dataset from that folder, or uploading a dataset from ...
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Suppose you have a ERM containing about 40 Classes / Entities. Most of them in quantified relations to others, some of them as standing there alone. How to deal with a very often used relation/...
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There was this question on my mock and I am just really confused about it. I tried to learn about class diagrams in more detail but there was no information that explained to the detail of the ...
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The answer to this question is A however I can't wrap my head around how there is a inheritance given the only information is the quote below (ie. a player is not a kind of team). It would make more ...
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I'm drawing the class diagram that depicts the domain model of a system. This diagram is for requirements analysis purposes so it is completely implementation-agnostic. I want to communicate the ...
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I have the following classes: public class MyCaller{ @Inject private MyService service; private void callerMethod(int arg1, String arg2){ service.serviceMethod(arg1, arg2); } }...
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In a class diagram, how do I know what methods to add? I’m not sure what the connection is between methods and other (i.e. Activity and User Case) diagrams. My guess is that methods can come from ...
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I have the following UML class diagram in a C++ context. I want to make sure that a Customer can have only one role: Can the Customer now only assume one role, and what does <<abstract>> ...
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I face a problem in understanding how this situation can be traduced to an ER diagram. So I have an entity, let's call it car, and then, there are another entities, that are a type of car. For example,...
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As title says, I'm currently working on an alaysis model for a little website similar to Reddit for academic purposes. I have one use cases written like this (They're not in English so they may not ...
cidra's user avatar
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My teacher told me that in the entity-control-boundary we need to create a boundary class for each view of mock-up but I can't really understand if this is always true. For example if i have a mock up ...
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I am going over tutorials regarding class design; in one, a videotape can have multiple copies and each copy can be borrowed by a borrower. Please see figure A: I am trying to understand why the ...
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In the below figure, a CD shop has CD cupboards, and inside it has shelves. CDs could be rented, and class CD Copy represents the actual CDs that are rented. My question is, should I represent Shelves ...
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I am trying to find a good way of allowing two objects that are separated by a intermediate object to communicate while keeping the architecture loosely coupled. A solution I have developed is to pass ...
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about those objects and arraylists inside the classes, derived from one-to-many relationships, using the ORM techniques, what's the best way to deal with them at the time of setters and validation ...
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Should i include the different functions of open account, close account , withdraw in the customer class(as shown in the picture) or should i include it in the account class
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I would like to create a dynamic appointment system between teacher and student to easily allow them to make an appointment. In this system, teachers select their 30 minutes time slot availabilities ...
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I'm looking for an efficient way to create appointments between teachers and students. I want teacher to be able of make their students know their availabilities : For example, A Teacher writes on the ...
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I am getting confused at qualification association. I perform qualification when I need to remove many-to-many relationship or when the PK of a particular table is not able to be uniquely identify a ...
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Please consider a class diagram and a component diagram as shown below. In the class diagram I use association classes to represent the relationship between two classes (BaseLink and ShoulderLink) as ...
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My goal is to define a Service class which process method accepts a RequestType argument that is defined by the contained ServiceType and returns an object of a type defined by ServiceType. By doing ...
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My scenario involves the following classes: I have three types of Peer that creates a RegistryType instance because its methods are needed. Same for Identity class. Each PeerType need 0 or all the ...
Antonio Santoro's user avatar
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Say we have to create a model for a company, where employees can be part of many different teams. A team can have member members. Members can be part of many teams. How to design database tables for ...
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I'm trying to model a simple Graph structure as an UML Class Diagram and Object Diagram. A Graph can have multiple Nodes and knows it's starting Node. Every Node has a predecessor and a successor Node....
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I'm learning OOP so I decided to start a new project, a chess tournament manager. Here you can read about chess tournaments https://en.m.wikipedia.org/wiki/Chess_tournament Basically the user will be ...
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I was reading an old text book "Beginning C# Object oriented programming" from 2011. The author in one case employs the "use case" to identify classes and then goes to draw a class ...
microwth's user avatar
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I was creating a class model using inheritance, and have a situation I don't know how to represent. For this question I built an example diagram in which I have a class Person with some attributes. I ...
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I am given the following system description : Consider a hotel management system to manage a group of 5-stars hotels. If this system is modelled using OOP methodology, and the classes are identified ...
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So I just started studying Software Engineering because I am really interested in it and my professor in London asked us to create an app which is like Instagram (only theoretically, without the ...
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In the UML specification 2.5.1 (Link) on page 117 it is specified that the notation of operations (methods) should look like the following: [<visibility>] <name> ‘(‘ [<parameter-list>...
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Goal: I am trying to create a UML class diagram for a java spring application. Spring uses a lot of annotations and I couldn't find any resources online on how to properly model them in UML. I know ...
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I have the following constructor in a class for a code I'm writing an assignment on for school: public Plant(int xPos, int yPos,int width,int height, int hp,String imageLocation,String audioLocation,...
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I need to finish a task in my homework. I need to include a use case diagram. I have the following situation I have a master, admin, manager, seller and attendant users. It is like this, master is the ...
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