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Core java - Interview Questions and Answers for 'Roposo' - 5 question(s) found - Order By Newest

Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.
  Q1. What is rule regarding overriding equals and hashCode method ?Core Java
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Ans. A Class must override the hashCode method if its overriding the equals method.

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   Like      Discuss      Correct / Improve     java   collections   hashcode  hash code   equals   collections     Cognizant (CTS)  CapitalOne  Tata Consultancy (TCS)  HCL Technologies  Deloitte  Wipro  Infosys  Sabre  Sophos   Tieto  Addteq  Priceline.com  Cisco Systems  Visa Inc  Vibrant Media  Audience Science  GT Nexus  OpenCrowd  Instinet  Kronos  Elsevier  IMC Financial  LG Mobile  Dun & Bradstreet  WBUT  codecentric  Satmetrix  Interactive Brokers  Roposo  SecureView  Azuga  Envestnet  Criteo  Skillz  MobileIron  Walmart  R Systems  Overstock.com  Verilogue  Goldstone Technologies  FatWire  LinkedIn  Southwest Airlines  Crossover for Work      intermediate        frequent

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 Q2. What is a ConcurrentHashMap ?Core Java
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Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap.

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   Like      Discuss      Correct / Improve     java   collections   hashmap   map   concurrenthashmap   concurrenthashmap  concurrency   general electric   ge     Cognizant (CTS)  Synechron  General Electric  MakeMyTrip.com  Nomura Securities  Xpanxion  Royal Bank of Scotland (RBS)  ProKarma  Talentica  Citi  EdgeVerve Systems  Six Dee Telecom  ReqRoute  Qumulo  Goldman Sachs  HSBC Holdings  AlertMe.com  BlackRock  Helpchat  Bally Technologies  Hubzu  Xpanxion  Coromandel Infotech  Paytm  YuMe  InfoGain  Markit  Wells Fargo  Geometric  Acloudzyn Technologies  Roposo  Nagarvision        rare


 Q3. What are the advantages and disadvantages of CopyOnWriteArrayList ?Core Java
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Ans. This collections class has been implemented in such a manner that it can never throw ConcurrentModificationException. As it performs update and write operations by creating a new copy of ArrayList, It's slower compared to ArrayList.

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   Like      Discuss      Correct / Improve     java   collections   list   arraylist   copyonwritearraylist   advantages-disadvantages   ConcurrentModificationException     Cognizant (CTS)  Engine Singapore  Credit Agricole  Roposo      Expert


 Q4. What are fail-fast Iterators ?Core Java2016-06-09 09:27:36

Ans. Fail-fast iterators detect illegal concurrent modification during iteration and fail quickly and cleanly rather than risking arbitrary, non deterministic behavior at an undetermined time in future. Example could be of an Iterator failing if it smells ConcurrentModificationException.

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   Like      Discuss      Correct / Improve     fail-fast Iterators  Iterators     Roposo  Elitecore Technologies  Google  InfoTrellis  Infosys      intermediate


Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q5. 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

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