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Interview Questions and Answers for 'Cerner' - 12 question(s) found - Order By Newest

Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback )
  Q1. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

  Sample Code for equals

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   Like      Discuss      Correct / Improve     java   string comparison   string   object class   ==    equals   object equality     Ebay  Cerner  GuideWire  Expeditors Associate  Revature  SAIC  ValueLabs  Realty Redefined  Bank Of America  Capgemini  HCL Technologies  Goldman Sachs  Symmetric Corp  Backstop Solutions  Frontier  IQOR   Science  Vanguard  eClinicalWorks  Experticity  Blue Cross and Blue Shield of Kansas  ComTrade  Banja Luka  Overstock.com  Intrasoft International  IBM  Apex Systems  infoview technologies  Ebix  Cumulus Systems  Nakisa  United HealthGroup (UHG)  Sopra Steria  TrueCaller  Mphasis      basic        frequent

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Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q2. What is the difference between ArrayList and LinkedList ?Core Java
admin
info@buggybread.com
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 across all type of companies and across all levels.
  Q3. Difference between Public, Private, Default and Protected ?Core Java
Anonymous
Ans. Private - Not accessible outside object scope.

Public - Accessible from anywhere.

Default - Accessible from anywhere within same package.

Protected - Accessible from object and the sub class objects.

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Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations.
  Q4. Difference between StringBuffer and StringBuilder ?Core Java
Anonymous
Ans. StringBuffer is synchronized whereas StringBuilder is not.

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 Q5. What is race condition ?Operating System
Admin
info@buggybread.com
Ans. A source of possible errors in parallel programming, where one thread can cause an error in another thread by changing some aspect of the state of the program that the second thread is depending on (such as the value of variable).

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   Like      Discuss      Correct / Improve     java.threads   multithreading   race condition   parallel programming   synchronization   ebay   concurrency     ISB Vietnam  NetSpend  Polycom  Cerner  NVIDIA  US Bank  Amadeus  McKesson  Hulu  Neelkanth Digital


Frequently asked in CTS ( Based on 2 feedback )
  Q6. What is the difference between comparable and comparator in java.util pkg?Core Java
Admin
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  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      basic        frequent


  Q7. Explain the challenging problems you faced recently and how you overcame it ?General

Ans. [Open Ended Answer]

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   Like      Discuss      Correct / Improve     elsevier   open ended questions   overstock.com   cerner     Overstock.com  Elsevier  Infoview Technologies  Syntel  Hexaware  Yahoo  Nationwide  GE Transportation  Concur  MH Alshaya  Infosys  Capital One  HCL Technologies  Ann Arbor  PowerAdvocate        frequent


 Q8. Explain TDD or Test Driven Design ?Design

Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards.

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   Like      Discuss      Correct / Improve     elsevier   test driven design ( TDD )   software development methodologies     Elsevier  Deegit  Cerner        frequent


 Q9. Explain Agile Software Development Methodology ?Process2016-11-30 16:00:02

Ans. https://en.wikipedia.org/wiki/Agile_software_development

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   Like      Discuss      Correct / Improve     software development process  agile     Elsevier  Lexis Nexis  Cerner  IBM  Deegit        frequent



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 Q10. Scale yourself on Java on the scale of 1 to 10General2017-01-11 15:48:29

Ans. [Open Ended Answer]

The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions.

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

   Like      Discuss      Correct / Improve          Overstock.com  Revature  Incture Technologies  Nucsoft  Wipro  HCL Technologies  Tata Consultancy (TCS)  Infosys  Cerner  Nucsoft  Incture Technologies  macys  F5 Networks  IVY Comptech  Rubicon Project  Sogeti  AllState


  Q11. What is collection framework in Java ?Core Java2017-12-27 19:17:14

Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them.

  Sample Code for Map

  Sample Code for HashMap

  Sample Code for Treemap

  Sample Code for set

  Sample Code for hashset

  Sample Code for treeset

  Sample Code for list

  Sample Code for arraylist

  Sample Code for linkedlist

  Sample Code for queue

  Sample Code for priorityqueue

  Sample Code for concurrenthashmap

  Sample Code for vector

  Sample Code for stack

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   Like      Discuss      Correct / Improve     collections     Tata Consultancy (TCS)  HCL Technologies  Ancestry  Cerner  Accenture  Global Logic  MasterCard  Vyom Labs      basic        frequent


 Q12. What is MVC in GUI components ?Design2018-06-30 13:52:48

Ans. The Model/View/Controller pattern, a strategy for dividing responsibility in a GUI component.

The model is the data for the component.

The view is the visual presentation of the component on the screen.

The controller is responsible for reacting to events by changing the model.

According to the MVC pattern, these responsibilities should be handled by different objects.

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

   Like      Discuss      Correct / Improve     mvc  design pattern     Cerner        rare




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Cerner: Was interviewed for Java position but eventually ... Anonymous

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