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Interview Questions and Answers for 'Avaya' - 2 question(s) found - Order By Newest

Very frequently asked in phone and walk in interviews.
  Q1. What are Marker Interfaces ? Name few Java marker interfaces ?Core Java
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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   Like         Discuss         Correct / Improve     java   oops   interfaces   marker interface   serializable   clonable     Asked in 21 Companies      intermediate        frequent

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Related Questions

  Difference between serializable and externalizable interface ?
 How Marker interfaces works internally ?
  Is runnable a Marker interface ?
  Whats the purpose of marker interfaces ?
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 What is a delete marker wrt to S3 objects ?


Very frequently asked. Usually asked in this format or as difference with interfaces / concrete classes.
  Q2. What is an abstract class ?Core Java
Ans. Abstract class is the class that is not supposed to be instantiated. The purpose of the class to only have extension to the derived class.

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   Like         Discuss         Correct / Improve     abstract class     Asked in 6 Companies      basic        frequent


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  How is Abstraction implemented in Java ?
 Difference between Base Class, Derived Class , Abstract Class and Concrete Class ?
  Shall we use abstract classes or Interfaces in Policy / Strategy Design Pattern ?
  Will this code Work ? If not , Why ?
  Is java.util.Date an abstract Class ? Is java.util.Calendar an abstract Class ?



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