QUESTION 12 OF 20

What is a marker interface, and how do you use it when writing Java code for the Facebook environment?

The fact that this is a technical question is obvious since it asks you to define a term and then discuss how it is used. Make sure you answer each part of the question in the order asked. This will help the interviewer follow your answer and confirm that you are listening to their questions during the interview.

"A marker interface, as it is used in Java, is a design pattern which provides runtime information about the objects within the program. It also enables the addition of metadata with a class even though the Java language doesn't implicitly support metadata. When coding in Java, the marker interface is used as an interface which doesn't specify a method."

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Facebook Java Developer Mock Interview

What is a marker interface, and how do you use it when writing Java code for the Facebook environment?

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