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In a scenario where several unrelated classes must implement the same set of method signatures but share no implementation, which abstraction technique should be used?

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OOP & Design Patterns - Abstraction - Abstract Class vs Interface - When to Use Which

In a scenario where several unrelated classes must implement the same set of method signatures but share no implementation, which abstraction technique should be used?

AUse a concrete class and inherit from it.

BUse an abstract class with implemented methods.

CUse an interface to define the method signatures.

DUse a singleton pattern to enforce method implementation.

Step-by-Step Solution

Solution:

Step 1: Identify requirement
Multiple unrelated classes must implement certain methods without sharing code.
Step 2: Choose abstraction
Interfaces define method signatures without implementation, perfect for unrelated classes.
Final Answer:
Option C -> Option C
Quick Check:
Interfaces enforce contracts without code sharing [OK]

Quick Trick: Interfaces enforce method contracts without code sharing [OK]

Common Mistakes:

MISTAKES

Choosing abstract class which forces code sharing
Using concrete class inheritance which limits unrelated classes
Singleton pattern unrelated to enforcing method contracts

Trap Explanation:

PITFALL

Abstract classes imply shared code, which is not required here.

Interviewer Note:

CONTEXT

Tests understanding of when to use interfaces for unrelated classes.

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