Questions about interface related design considerations, such as programming to the interface.
33
votes
7answers
19k views
When to use abstract classes instead of interfaces with extension methods in C#?
"Abstract class" and "interface" are similar concepts, with interface being the more abstract of the two. One differentiating factor is that abstract classes provide method implementations for derived ...
60
votes
19answers
16k views
Why are interfaces useful?
I have been studying and coding in C# for some time now. But still, I can't figure the usefulness of Interfaces. They bring too little to the table. Other than providing the signatures of function, ...
59
votes
13answers
13k views
Do I need to use an interface when only one class will ever implement it?
Isn't the whole point of an interface to for multiple classes to adhere to a set of rules and implementations?
32
votes
6answers
5k views
What is the point of having every service class have an interface? [duplicate]
At the company I work at, every service class has a corresponding interface. Is this necessarily? Most of these interfaces are only used by a single class and we are not creating any sort of public ...
1
vote
2answers
967 views
What other reasons are there to write interfaces rather than abstract classes? [duplicate]
Possible Duplicate:
When to use abstract classes instead of interfaces and extension methods in C#?
When I read and looked at codes using Abstract classes, I was able to justify it because ...
11
votes
8answers
2k views
What is the point of an interface? [duplicate]
Possible Duplicate:
When to use abstract classes instead of interfaces and extension methods in C#?
What other reasons are there to write interfaces rather than abstract classes?
This ...
22
votes
4answers
7k views
Why should I prefer composition over inheritance?
I always read that composition is to be preferred over inheritance. A blog post on unlike minds, for example, advocates using composition over inheritance, but I can't see how polymorphism is ...
9
votes
7answers
2k views
Default vs Impl when implementing interfaces in Java
After reading Should package names be singular or plural? it occurred to me that I've never seen a proper debate covering one of my pet peeves: naming implementations of interfaces.
Let's assume ...
36
votes
11answers
3k views
Is it bad habit not using interfaces?
I use interfaces rarely and find them common in others code.
Also I create sub and super classes (while creating my own classes) rarely in my code.
Is it a bad thing?
Would you suggest changing ...
8
votes
3answers
5k views
Difference between various Collection Generic Interfaces in C#
I have been playing around with C# for Windows and ASP.net MVC development for some time now. But I am still unclear on a few areas. I am trying to understand the basic difference between and ...
15
votes
10answers
2k views
Declaring interface in the same file as the base class, is it a good practice?
To be interchangable and testable, normally services with logic needs to have interface, e.g.
public class FooService: IFooService
{ ... }
Design-wise, I agree with this, but one of the things ...
2
votes
5answers
434 views
Design Methodology for Developing Interoperable Systems?
A bit of background
The company I work for has been creating database applications since around 1980 and, until relatively recently, most of these systems have been stand-alone "silo" systems.
...
2
votes
7answers
1k views
Architectural patterns for interaction beyond MVC? [closed]
We all know the venerable Model-View-Controller pattern used to design interaction [mostly] with human users. It is the de-facto standard in OOP environment.
What are some other architectural ...
9
votes
7answers
996 views
Interfaces on an abstract class
My coworker and I have different opinions on the relationship between base classes and interfaces. I'm of the belief that a class should not implement an interface unless that class can be used when ...
1
vote
3answers
201 views
Should I use an interface when methods are only similar?
I was posed with the idea of creating an object that checks if a point will collide with a line:
public class PointAndLineSegmentCollisionDetector {
public void Collides(Point p, LineSegment s) {
...
