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What will happen if we provide concrete implementation of method in interface?

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What will happen if we provide concrete implementation of method in interface?

(a) The concrete class implementing that method need not provide implementation of that method

(b) Runtime exception is thrown

(c) Compilation failure

(d) Method not found exception is thrown

I had been asked this question during a job interview.

This interesting question is from Interfaces in portion Interfaces & Packages of Java

1 Answer

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Best answer
Right answer is (c) Compilation failure

The best explanation: The methods of interfaces are always abstract. They provide only method definition.

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