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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
Anonymous
Ans. These are the interfaces which have no declared methods.Serializable and cloneable are marker interfaces.

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Very frequently asked. Usually asked in this format or as difference with interfaces / concrete classes.
  Q2. What is an abstract class ?Core Java2017-01-10 13:12:20

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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