Inheritance is a way to reuse code of existing objects, or to establish a subtype from an existing object, or both, depending upon programming language support.
0
votes
5answers
285 views
Why we use virtual and override keywords in c#
Can anyone explain me what's the point of overriding base class implementations (if its not abstract), because it's not ethical move to modify features of the parent class according to the wishes of ...
0
votes
2answers
126 views
Python — when should a class have-a rather than be-a?
This is related to "Extends is evil" vs. OCP? but separate because the idea of "implement the interface" doesn't exist in Python.
I'm writing a class to pull some data off a webpage. It's ...
5
votes
9answers
747 views
How can designing for inheritance cause extra cost? [closed]
So I wanted to inherit from a sealed class in csharp and got burned. There is just no way to unseal it unless you have access to the source.
Then it got me thinking "why sealed even exists?". 4 ...
0
votes
1answer
112 views
Will having ClassA extend ClassB slow down my runtime performance compared to having classC which contains all the members of ClassC?
I have a class with a lot of methods. I would like to group similar methods together in their own class, but all of the methods need to extend another class, ClassC. So I was thinking of having ...
0
votes
6answers
103 views
What are the reasons to create UIView subclass?
I've noticed that there are a lot of UIView subclasses in my legacy project. Mostly the only reason of such a subclass is to split bigger view into custom subviews and provide layout for its subviews ...
4
votes
4answers
259 views
Can a method that must be overridden be considered private?
Suppose I have a class C with a method f() which is meant to be used only within C's implementation, but which should be overridden by C's subclasses.
Is it reasonable, or "pythonic", to consider it ...
3
votes
3answers
130 views
Which one subsumes the other: class-based object-orientation or prototypal inheritance?
In this talk: http://www.youtube.com/watch?v=hQVTIJBZook, Douglas Crockford claims that class-based object-orientation can be represented in terms of prototypal inheritance. The construction he gives ...
4
votes
1answer
204 views
Is using protected inheritance to hide (but exploit) implemented interface from the public ok?
Recently, we had a discussion about code using protected inheritance in order to hide the fact (to client code) a class inherits from a specific base class but to exploit this fact in the ...
1
vote
1answer
69 views
Internal exposure of implementation details on inheritance
I'm reading the "Effective Java" book which suggests to favor composition over inheritance. The example it gives shows something like this:
public class InstrumentedHashSet<E> extends ...
0
votes
3answers
135 views
Explanation of the definition of interface inheritance as described in GoF book
I am reading the first chapter of the Gof book. Section 1.6 discusses about class vs interface inheritance:
Class versus Interface Inheritance
It's important to understand the difference between ...
2
votes
3answers
169 views
Java class to enforce an implementation of super classes' public methods
I have the following :
public Class A {
public void methodA() {
....
}
public void methodB() {
....
}
}
I don't have control over Class A. I would like to create ...
2
votes
1answer
180 views
Adding base-class (inherited) functionality to classes that you don't control
I have a set of classes from a 3rd party library. These classes use an inheritance structure to share logic. I would like to add a layer of abstraction in the middle of their inheritance tree to add ...
1
vote
3answers
293 views
Does non-virtual-by-default lead us to composition-over-inheritance?
There are some design guidelines about testable code in “The Art of Unit Testing”. The first one is “Make methods virtual by default”. I’m curious to know your idea about non-virtual-by-default ...
0
votes
3answers
256 views
What is good practice when inheriting static classes isn't possible/allowed
I am developing a project in C# and due to a design decision it is not possible to have a static class inherit another static class. But I have, in my opinion, a case where this would make sense.
I ...
0
votes
1answer
100 views
Refactoring classes with ref to themselves
How can I refactor this code?
class Node
{
public Node Parent { get; set; }
}
class AVLNode
{
public AVLNode Parent { get; set; }
}
I tried to use inheritance, but then I have to use type ...
