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Interview Questions and Answers for 'The Advisory Board Company' - 4 question(s) found - Order By Newest

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q1. What is the difference between ArrayList and LinkedList ?Core Java
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Ans. Underlying data structure for ArrayList is Array whereas LinkedList is the linked list and hence have following differences -

1. ArrayList needs continuous memory locations and hence need to be moved to a bigger space if new elements are to be added to a filled array which is not required for LinkedList.

2. Removal and Insertion at specific place in ArrayList requires moving all elements and hence leads to O(n) insertions and removal whereas its constant O(1) for LinkedList.

3. Random access using index in ArrayList is faster than LinkedList which requires traversing the complete list through references.

4. Though Linear Search takes Similar Time for both, Binary Search using LinkedList requires creating new Model called Binary Search Tree which is slower but offers constant time insertion and deletion.

5. For a set of integers you want to sort using quicksort, it's probably faster to use an array; for a set of large structures you want to sort using selection sort, a linked list will be faster.

  Sample Code for ArrayList

  Sample Code for LinkedList

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   Like      Discuss      Correct / Improve     collections   java   data structures   arraylist   linkedlist     Deutsche Bank  Overstock.com  HCL Technologies  Infosys  EBay  The Advisory Board Company  Accuity  JC Penney  Cerner  Chase  Amazon  Deloitte  Deegit  Tata Consultancy  Cognizant (CTS)  IBM  Accenture  Mindtree  ESRI  QwikCilver Solutions  TMC Bonds  GumGum  EMC  Yelp  Classteacher Learning System  FactSet  Simply Hired  SalesForce  Royall & Company  Indeed  eClinicalWorks  TravelClick  State Farm  Manhattan Associates  GoEuro  Veeva Systems  Ness Technologies  Marlabs  Rolta  Volante Technologies  Happiest Minds Technologies  Coviam  Velocify  zanox  SimplyHired  IDBI Intech  Wissen Infotech  Nike  OnDot  PexSupply  Pramati Technologies  Credit Agricole  Mastek  Six Dee Telecom  Accuity  Kellton Tech  conduent  citrix  NEC Technologies      Basic        frequent

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Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q2. Difference between TreeMap and HashMap ?Core Java
Anonymous
Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly.

  Sample Code for treemap

  Sample Code for hashmap

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

   Like      Discuss      Correct / Improve     java   collections   map   treemap   hashmap     Amber Road  CTS (Cognizant)  ION Trading  DataMetica  Accenture  The Advisory Board Company  BidGely  Infosys  Tata Consultancy (TCS)  HCL Technologies  Wipro  Booking.com  MakeMyTrip  Garena Online  Garmin  ION Trading  Accuity  Palantir Technologies  Books International  Wealthfront  Marin Software  Garmin  IBM  Global Logic  Fiserv  Cumulus Systems  CCTS  UST Global  Cumulus Systems   Apcolite      basic        frequent

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 Q3. What is the use of Transient Keyword ?Core Java
Anonymous
Ans. It in Java is used to indicate that a field should not be serialized.

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

   Like      Discuss      Correct / Improve     java   oops   serialization   transient   java keywords     Cognizant (CTS)  The Advisory Board Company  HCL Technologies  Tata Consultancy (TCS)   Accenture      intermediate        frequent

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  Q4. Can we overload main method in Java ?Core Java
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Ans. Yes, but the overloaded main methods without single String[] argument doesn't get any special status by the JVM. They are just another methods that needs to be called explicitly.

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   Like      Discuss      Correct / Improve     java   main method   overloading   yes-no     The Advisory Board Company  Thomson Reuters  ePace Technologies  PC Technology  PEOL  MilleniumSoft      intermediate        frequent




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