C Sharp (C#) - Interfaces
What is the output of this code?
interface ITest { void Print() => Console.WriteLine("Interface"); } class Test : ITest { } class Program { static void Main() { ITest t = new Test(); t.Print(); } }
What is the output of this code? interface ITest { void Print() => Console.WriteLine("Interface"); } class Test : ITest { } class Program { static void Main() { ITest t = new Test(); t.Print(); } }
medium📝 Predict Output Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze interface and class implementation
Interface ITest has a default method Print() that writes "Interface". Class Test implements ITest but does not override Print().Step 2: Determine method call behavior
Calling Print() on ITest reference calls the default interface method, printing "Interface".Final Answer:
Interface -> Option AQuick Check:
Default method call output = B [OK]
Quick Trick: Default method runs if class does not override [OK]
Common Mistakes:
MISTAKES- Expecting class method output without override
- Thinking compile error occurs without override
- Confusing interface and class outputs
Master "Interfaces" in C Sharp (C#)
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