All Questions
Tagged with design-patternsobject-oriented
692 questions
2votes
3answers
284views
How do I model this scenario so that it adheres to OOP principles?
I have a Slide class with subclasses referring to the different types of slides (IntroSlide, SummarySlide, etc.): abstract class Slide { String slideType; final String title; final String ...
- 47
2votes
3answers
261views
What is the relationship between the terms "association", "aggregation", and "composition"? [closed]
I try to brush up on my technical interview skills as I plan to seek a better offer I don't recall being ever asked that really, but I still want to clear up any confusion. What is association, ...
- 1,531
3votes
4answers
600views
Why is "dependency injection" ok, but not "the opposite of preserve whole object (pass required parameters only)"?
According to Why should I use dependency injection?, "dependency injection" has some advantages, for example: "Non dependency injection" version: public class Client{ private ...
- 2,983
12votes
5answers
4kviews
Why is "hidden dependency" (required things not in parameter list directly) a disadvantage of "global variables", but not in "preserve whole object"?
According to https://softwareengineering.stackexchange.com/a/200092, as I know, "preserve whole object" is a refactor method that passes the whole object instead of required parameters only, ...
- 2,983
7votes
8answers
5kviews
Is "avoid extra null pointer risk" a reason to avoid "introduce parameter objects"?
According to Should we avoid custom objects as parameters?, I know I can group related parameters to improve readability of the function, eg: Original version: public void showSchedule(long startDate,...
- 2,983
1vote
1answer
336views
Mapping complex objects to other similar complex objects
I am working on two applications that serve the same purpose. The first application is more feature rich and its types are more complex, but uses old technologies and will be retired. It will ...
- 127
3votes
3answers
272views
Handle hierarchical relationships between large number of enums
I am working on a C# project and I have a somewhat large number of labels (~100) that have some sort of relationships between one another. Here is a minimal dummy example that illustrates this: ...
0votes
2answers
275views
What is a good architecture / design pattern for giving multiple shared attributes in different combinations?
I have a need for many different objects to have various combinations of attributes. For a demonstrative example, a flaming dog would have a dog attribute, a flame attribute, and a tail attribute, ...
- 111
1vote
1answer
164views
How to implement DMG (Game boy) cpu's register using OOP patterns/principles to max code reusability?
I-m looking to learn better use of OOP principles/patterns so I decided to start implementing at least the basics of a GB emulator (technical part is widely covered on diff sites). So I started with ...
- 125
1vote
2answers
287views
How to deal with boolean or enum variables used to decide code flow?
I am working on algorithm implemented in C++ that maintains several enum types. Say 3 to 4 enum types each with at least 4 different values. Plus the code maintains several boolean variables. The code ...
- 301
0votes
1answer
153views
Should I "introduce parameter object" for the case that the parameter is originally already a whole object?
According to Should we avoid custom objects as parameters?, for example, if I have an object to show: public class Student{ public int _id; public String name; public int age; public ...
- 2,983
0votes
1answer
148views
How to model in OOP interactions with entities in other systems?
Assume we are designing a typical bank account management system. Customers can have one or more accounts. Customers can deposit cash, withdraw cash or transfer money to another account (and, of ...
- 109
0votes
4answers
233views
What is the advantage/disadvantage of returning a UnSubscribe class to Observer as opposed to just calling a UnSubscribe method of Observable?
There are two ways to provide a way unsubscribe in Observer Design Pattern. 1. Provide a simple void UnSubscribe method: public void UnSubscribe(IObserver observer){ // remove observer from List of ...
- 377
0votes
2answers
175views
Push and Pull Communication in object oriented: why Push style is not flexible?
I'm trying to learn Observer Design Pattern and I started to watch the series which belongs to codewithmosh called "The Ultimate Design Pattern Series". in the lesson which was about ...
- 29
0votes
0answers
98views
By creating an architecture, it is better to have many classes that handles different scenarios, or a single one that handles all? [duplicate]
During my limited professional experience, I have been involved in microservices projects with a common structure: The Controller takes a request and validates it using the jakarta.validation....
