Core Java - Interview Questions and Answers for 'Marker interfaces' | Search Interview Question

Core Java - Interview Questions and Answers for 'Marker interfaces' - 6 question(s) found - Order By Newest

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Q1. What are Marker Interfaces ? Name few Java marker interfaces ?

Ans. An interface without any method declaration is called as marker interface. there are 3 in-built interfaces in JVM i.e. serializable, clonable, remote

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Q2. Difference between serializable and externalizable interface ?

Ans. Serializable is a marker interface whereas externalizable is not.

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Q3. How Marker interfaces works internally ?

Core Java

^{This question was recently asked at 'GGK Technologies'.This question is still unanswered. Can you please provide an answer.}

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Q4. Is runnable a Marker interface ?

Core Java

Ans. No , it has run method declared.

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Q5. Whats the purpose of marker interfaces ?

Ans. They just tell the compiler that the objects of the classes implementing the interfaces with no defined methods need to be treated differently.

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Q6. What is a cloneable interface and what all methods does it contain?

Core Java

Ans. Cloneable is a declaration that the class implementing it allows cloning or bitwise copy of it's object state. It is not having any method because it is a MARKER interface.

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Q7. Which of the following is a Marker Interface ?

Core Java

a. Runnable

b. Serializable

c. Cloneable

d. Both Serializable and Cloneable

Ans.d. Both Serializable and Cloneable

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