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Interview Questions and Answers for 'Virtusa Polaris' - 4 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q1. Differences between abstract class and interface ?Core Java
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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Frequently asked in CTS ( Based on 2 feedback )
  Q2. What is the difference between comparable and comparator in java.util pkg?Core Java
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info@buggybread.com
Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

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   Like      Discuss      Correct / Improve     java   java.util   comparable   comparator   collections     Verilogue  Accenture  Accenture India  Varian Medical Systems  L&T Infotech  Oracle  eIntern  Happiest Minds Technologies  HCL Technologies  Cognizant (CTS)  Cerner  Coviam  EdgeVerve Systems  Virtusa Polaris  Trimax IT Infrastructure & Services  Xpanxion  Appy Pie  WealthFront  Varian Medical Systems  Bristlecone  Verilogue  Guavus  eClinicalWorks      basic        frequent


Frequently asked in face to face interviews.
  Q3. Write a program to print fibonacci series.Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q4. How is Hashmap internally implemented in Java ?Core Java2016-12-06 08:49:37

Ans. https://www.quora.com/How-is-Hashmap-in-Java-implemented-internally-What-are-the-pros-and-cons-to-use-it-What-are-the-complexities-it-provides-for-insert-delete-and-lookup/answer/Anshudeep-Bajpai?srid=iwnK

 Help us improve. Please let us know the company, where you were asked this question :   

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