C Sharp (C#) - Interfaces
Why does C# allow interfaces to have default implementations starting from recent versions?
Why does C# allow interfaces to have default implementations starting from recent versions?
hard🧠 Conceptual Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand default interface methods purpose
They allow adding new methods with default code so existing classes don't break.Step 2: Evaluate other options
A is false as they complement abstract classes; B is false because interfaces still cannot store state; D is false because interfaces cannot be instantiated.Final Answer:
To enable adding new methods without breaking existing implementations -> Option DQuick Check:
Default methods = backward compatibility [OK]
Quick Trick: Default methods prevent breaking old code when interfaces evolve [OK]
Common Mistakes:
MISTAKES- Thinking interfaces store data
- Confusing interfaces with classes
- Assuming interfaces can be instantiated
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