All Questions
17 questions
0votes
2answers
730views
Should I instantiate the state objects of a finite state machine?
I have a class hierarchy with a base State class, several inheriting classes each named after their relevant state, and an FSM class that contains all the states in a particular state machine as well ...
- 329
3votes
5answers
371views
Add specific behavior inside classes
I'm learning to make games with OOP and there's something I don't understand. What I can see is that the more I add methods to a class, the less it becomes reusable and flexible. For example, if we ...
- 233
1vote
1answer
180views
Building a MVC Framework: Should I get an instance of Database, or should I extend with a "general" model class that already has an instance of DB
I am trying to get a database instance via any model-class that uses the database. This is ideal in my opinion: class UserAuthenticator { private $db; private $customer; public ...
- 165
3votes
3answers
392views
How to store objects with inconsistant properties
I have real-world materials that are defined by various properties, some common, some not, that I would like to map to objects in C#. For example, Concrete has properties A, B, C, and Metal has ...
- 141
2votes
1answer
444views
Mediator pattern or facade or ...?
I'm writing an app which tracks device location and based on some factors (user gets an assignment), it needs to change the location tracking settings (for example, frequency). I have an issue with ...
- 203
3votes
2answers
185views
When to use a repository/service vs an instance variable?
When does an object truly belong to a class? I'm familiar with the "has-a" relationship, but in the case of an Employee object, it "has-a" 401k, but it's not really composed of a 401k object. As an ...
- 1,274
11votes
2answers
12kviews
Design patterns for creating objects that have a list of objects that also have a list of objects
In terms of good OOP design, what is the best way to structure code that is just containers of list of objects that contains other lists of objects that also are just other containers? Example: A ...
- 581
14votes
4answers
2kviews
How specific should the Single Responsibility pattern be for classes?
For example, suppose you have a console game program, which has all kinds of input/output methods to and from the console. Would it be smart to keep them all in a single inputOutput class or break ...
- 444
-1votes
2answers
229views
Per my design requirements, does this design hierarchy seem reasonable?
Background Construction Note that I am using C# here, but it may not be necessary to provide input to my conceptual questions about design. Consider the following design methodology... I work at a ...
- 2,748
1vote
3answers
2kviews
How To Extend Parent Methods in Children Classes?
There is a parent class with a method which many children use but many children extend the method, what is the best way to extend it without violating DRY? Here are my 2 current solutions: 1: The ...
1vote
2answers
848views
How should I structure these Python classes?
Base Class I have a class called Remote. This class represents a remote machine and has properties such as ip, hostname, username, and password, as well as methods for transferring files to/from the ...
- 111
0votes
4answers
722views
Fixing class Hierarchy design mistakes due to incorrect inheritance
I have a code like this. My derived class man, may not properly have a member function declared pure virtual higher up the hierarchy. eg. WagTail here class mammal{ public: virtual void WagTail() ...
1vote
3answers
204views
where should put showSchedule method in school system
In my school management system I have this partial class diagram: 1- In one use case student want to see his schedule of classes in week. this is what i suppose to do: get student object from ...
- 1,355
3votes
2answers
2kviews
many to many relation in database schema and oop class diagram
I have Student and Group entities. Student can have many groups and Group can have many students too. so in database I should have middle class and change many-to-many relation to one-to-many and many-...
- 1,355
6votes
4answers
5kviews
When should something be a class? And are my chosen classes good OO design?
My background: I am new to programming. Python is my only programming knowledge. I program as a hobby, and I'm teaching myself by reading copious amounts of books. I understand enough about OOP to ...
- 261
