Comparison : interface methods vs virtual methods vs abstract methods?

Virtual and abstract are almost the same. A virtual method has an implementation in the base class that can optionally be overridden, while an abstract method hasn't and must be overridden in a child class. Otherwise they are the same.

Choosing between them depends on the situation. If you got a base implementation, you use virtual. If you don't, and you need every descendant to implement it for itself, you choose abstract.

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