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What are the components of a marker interface?

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What are the components of a marker interface?

(a) Fields and methods

(b) No fields, only methods

(c) Fields, no methods

(d) No fields, No methods

This question was posed to me in semester exam.

I'm obligated to ask this question of Reflection API topic in section Session Management, JSP & API of Java

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Correct answer is (d) No fields, No methods

The explanation is: Marker interface in Java is an empty interface in Java.

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