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    Question

    What is an interface in OOP (e.g., Java,

    C#)?
    A A class that can be instantiated but cannot be inherited. Correct Answer Incorrect Answer
    B A blueprint of a class that contains only abstract methods and constants. Correct Answer Incorrect Answer
    C A class that provides a default implementation for all its methods. Correct Answer Incorrect Answer
    D A mechanism for multiple inheritance of implementation. Correct Answer Incorrect Answer
    E A way to hide data from external access. Correct Answer Incorrect Answer

    Solution

    An interface defines a contract: it specifies a set of methods that a class must implement. It typically contains only method signatures (abstract methods) and constant fields, without providing any implementation details (though Java 8+ allows default and static methods).

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