Mastering Java: The Ultimate Quiz for 'Thinking in Java

Question: 1 / 510

What must classes do to conform to an interface?

Declare all interface fields

Implement all abstract methods

Classes that implement an interface must provide implementations for all of the abstract methods declared in the interface. Option A is incorrect because interfaces do not have fields, they only have method signatures. Option C is incorrect because interfaces cannot be extended, they are implemented. Option D is incorrect because interfaces do not have default implementations, they only provide method signatures. Therefore, the correct answer is B, since implementing all the abstract methods in an interface is a key requirement for classes to conform to an interface.

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Extend another concrete class

Provide default implementations

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