All Questions
Tagged with inheritance composition
14 questions
142
votes
5
answers
73k
views
Why should I prefer composition over inheritance?
I always read that composition is to be preferred over inheritance. A blog post on unlike kinds, for example, advocates using composition over inheritance, but I can't see how polymorphism is achieved....
- 2,028
157
votes
15
answers
51k
views
Where does this concept of "favor composition over inheritance" come from?
In the last few months, the mantra "favor composition over inheritance" seems to have sprung up out of nowhere and become almost some sort of meme within the programming community. And every time I ...
58
votes
9
answers
25k
views
Code Smell: Inheritance Abuse [duplicate]
It's been generally accepted in the OO community that one should "favor composition over inheritance". On the other hand, inheritance does provide both polymorphism and a straightforward, terse way of ...
- 17.3k
44
votes
2
answers
64k
views
Why is inheritance generally viewed as a bad thing by OOP proponents [duplicate]
I keep hearing the phrase "Favour Composition over Inheritance" from GoF, which is being annoyingly mentioned repeatedly by my friend, who thinks it is a valid blanket statement. But is it ...
- 701
38
votes
3
answers
11k
views
Is "composition over inheritance" violating "dry principle"?
For example, consider I have a class for other classes to extend:
public class LoginPage {
public String userId;
public String session;
public boolean checkSessionValid() {
}
}
and ...
- 5,722
4
votes
1
answer
858
views
Composition vs. Inheritance [duplicate]
Here's what is given:
public interface Request {}
// there are 20 subclasses of Request
public class CreateUserRequest implements Request {
@NotEmpty
public String userName;
}
// request ...
- 1,574
13
votes
3
answers
6k
views
Composition over inheritance but
I'm trying to teach myself software engineering and coming up against some conflicting information which is confusing me.
I've been learning OOP and what abstract classes / Interfaces are and how to ...
- 319
8
votes
5
answers
1k
views
How do we know to favour composition over generalisation is always the right choice?
Whether an object physically exists or not, we can choose to model it in different ways. We could arbitarily use generalisation or composition in many cases. However, the GoF principle of "favour ...
- 1,966
7
votes
7
answers
5k
views
Inheritance using non-abstract base class
This post is based on the question https://stackoverflow.com/questions/49002/prefer-composition-over-inheritance/11758048#comment15634305_11758048.
Some people said - check whether there is “is-a” ...
- 987
5
votes
6
answers
972
views
What is the correct OOP relation between complex and real numbers?
On one hand
class complex {
double real;
double imaginary;
}
it is composition
on the other hand
class complex : double {
double imaginary;
}
it is inheritance
Which one is correct? ...
- 157
5
votes
2
answers
1k
views
Design classes to model 3D scanned faces of ancient Greek/Roman sculptures: is multiple inheritance a good design solution?
I would like to deepen the topic of multiple inheritance using Python and I usually find examples that are too simple. I love art and I imagined the following problem and I want to understand if ...
- 398
3
votes
1
answer
361
views
Is this a misuse of "composition over inheritance"?
The general sentiment seems to be that composition is preferable, in most cases, over inheritance, as it leads to less coupling. But for a case like this,
module Publishable
def new?
@content....
- 319
0
votes
1
answer
408
views
Should I force "composition over inheritance" rule to class members?
As I know, according to "composition over inheritance" rule, we should avoid reusing a method by inheritance, but how about class members? Suppose I have parent and child classes like the following:
...
- 5,813
0
votes
2
answers
356
views
Inheritance versus Composition in a business application
I have a training management and tracking system, with a high level structure as follows:
We have a Role1, e.g. Manager, Shift-boss, miner, etc. and a Candidate, training for that Role. The role has ...
- 502