Core java - Interview Questions and Answers for 'Avaya' | Search Interview Question

Core java - 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 ?

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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Related Questions

Difference between serializable and externalizable interface ?

How Marker interfaces works internally ?

Is runnable a Marker interface ?

Whats the purpose of marker interfaces ?

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

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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Related Questions

Differences between abstract class and interface ?

Difference between Abstract and Concrete Class ?

If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?

What are the design considerations while making a choice between using interface and abstract class ?

How is Abstraction implemented in Java ?

Why can't we create an instance of abstract class ? Why is it restricted by compiler ?

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 ?

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