Linked Questions

So, we're all probably familiar with the example provided in most textbooks of the Liskov substitution problem involving a square inheriting from rectangle. The objection to this approach is that ...

Is there a way to use the existing features of object oriented programming languages to work around the square/rectangle problem? Can a child be defined in terms of being a more restrictive subset ...

First I want to say Java is the only language I ever used, so please excuse my ignorance on this subject. Dynamically typed languages allow you to put any value in any variable. So for example you ...

A certain failure of OOP is shown with a class Square inheriting from Rectangle, where logically Square is a specialization of Rectangle and should therefore inherit from it, but everything falls ...

I read that Liskov's substitution principle is violated if : Preconditions are strengthened, or Postconditions are weakened But I don't get fully yet how these two points would violate Liskov ...

I just wanted to check that I understand the LSP correctly and can solve it. I am taking the classic rectangle/square problem and attempting a solution: class Rectangle{ public $width; public ...

I am writing two classes in C#: A Matrix class that represents a general Matrix with n-by-m dimensions A SquareMatrix class that inherits from Matrix and has the constraint of being n-by-n The ...

I got into a debate on this question which distilled to if it is a good idea for a specialization of a class to add business rules. Unfortunately this point got trampled in the comments so I'm asking ...

My previous question was just with class diagram and because of some comments I thought I try to find an example with a little piece of code for the diagram to see if principles correct understood? ...

I have Document and ExternalDocument classes in my system, where ExternalDocument extends Document. The main distinction is that ExternalDocument holds onto externalDocumentId and externalEventId data ...