Linked Questions

How do I design a subclass whose method contradicts its superclass? Let's say we have this example: # Example 1 class Scissor def right_handed? true end end class LeftHandedScissor < ...

Overriding a method originally defined in the super class, by definition means this method will do different things when invoked on an object of the base class or an object of the subclass. So does ...

I am talking based on experience with Java and C#. I do not know if other language have different exception handling implementation. In order to achieve loose coupling, we need our code being ...

I was following this highly voted question on possible violation of Liskov Substitution principle. I know what the Liskov Substitution principle is, but what is still not clear in my mind is what ...

Say I have: interface Thing { GetThing(); } class FastThing : Thing { public int GetThing() { return 1; } } class SlowThing : Thing { public int GetThing() { ...

I am a bit confused as for what it really means. In the related questions (Is this a violation of the Liskov Substitution Principle?), it was said that the example clearly violates LSP. But I wonder, ...

Inspired by this answer: Liskov Substitution Principle requires that Preconditions cannot be strengthened in a subtype. Postconditions cannot be weakened in a subtype. Invariants of ...

I've have an animal class class Animal { public function eat(Food $food); } the subclass who inherit it actually cannot support all kinds of Food (Cat can only eat meat): class Cat extends ...

You who have worked with a framework implementing the MVC architectural pattern most likely know how these frameworks are usually implemented. They contain a base Controller class, which you extend, ...

While learning SRP and LSP, I'm trying to improve the design of my code to comply best with both of these principles. I have an employee class that has a calculatePay method on it. Firstly, I believe ...

I am learning a lot about this principle (also thanks to two answers I received here) and would like to elaborate on another point that somebody mentioned. 1) Is the following a violation of LSP? ...

I have a game that deals with opening and closing doors and the Door Engine deals with IDoor interface which has Open() and Close() contracts So far so good. the game is tested and works fine. Now a ...

I often encounter the following program while programming. There is a "partial" solution to a problem, which provides all the functionality that is necessary, but the documentation explaining said ...