[Solved] Which statement best describes when to use an interface instead of an abstract class in C#? - Ans: Use an interface when unrelated classes share behavior but do not share code. | C Sharp (C#)

C Sharp (C#) - Interfaces

Which statement best describes when to use an interface instead of an abstract class in C#?

AUse an interface when you want to provide shared code to subclasses.

BUse an interface when unrelated classes share behavior but do not share code.

CUse an abstract class when unrelated classes share behavior but do not share code.

DUse an abstract class only when no methods need to be implemented.

Step-by-Step Solution

Solution:

Step 1: Understand interfaces
Interfaces define method signatures without implementation, so they are ideal for unrelated classes that share behavior but not code.
Step 2: Understand abstract classes
Abstract classes can provide shared code and force subclasses to implement certain methods, so they are better for related classes sharing code.
Final Answer:
Use an interface when unrelated classes share behavior but do not share code. -> Option B
Quick Check:
Interface = unrelated classes sharing behavior [OK]

Quick Trick: Interfaces = behavior only, abstract classes = shared code [OK]

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