Interview Questions and Answers for 'Cognizant (cts)' | Search Java Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Interview Questions


 2679 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text

   



Interview Questions and Answers for 'Cognizant (cts)' - 71 question(s) found - Order By Newest

next 40
Advanced level question. Frequently asked in High end product companies. Frequently asked in Cognizant and Deloitte ( Based on 2 feedback )
  Q1. Why is String immutable in Java ?Core Java
Anonymous
Ans. 1. String Pool - When a string is created and if it exists in the pool, the reference of the existing string will be returned instead of creating a new object. If string is not immutable, changing the string with one reference will lead to the wrong value for the other references.

Example -

String str1 = "String1";
String str2 = "String1"; // It doesn't create a new String and rather reuses the string literal from pool

// Now both str1 and str2 pointing to same string object in pool, changing str1 will change it for str2 too

2. To Cache its Hashcode - If string is not immutable, One can change its hashcode and hence it's not fit to be cached.

3. Security - String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment.

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


   Like      Discuss      Correct / Improve     java   oops   string   string class   immutable   advanced     Barclays  Jungo  Cloudera  Allston  Man Group  Prokarma  Optimus  Gamesys  ABS  TransPerfect  Fidelity  Deloitte  Zalando  Cognizant (CTS)  Zeta Interactive  SuccessFactors   EchoStar  InterGlobe Technologies  HCL Technologies  Intuit  JP Morgan  Optimus Information  Faichi Solutions  Blip  Adobe  Subex Limited  Remo Software  Allstate  IBM  Bizmatics  Bytecode Cyber Security  Calsoft Systems  IDS Infotech  Nakisa      expert        frequent

Try 4 Question(s) Test


Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ) and Coginizant (CTS)
  Q2. Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?
Core Java
Anonymous
Ans. If the Object value will not change, use String Class because a String object is immutable.

If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster).

If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized).

  Sample Code for String

  Sample Code for StringBuffer

  Sample Code for StringBuilder

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


   Like      Discuss      Correct / Improve     java   string class   string   stringbuilder   stringbuffer     Cognizant (CTS)   San Jose State University (SJSU)  HCL Technologies   Deloitte  Sophos  Hitachi  JPMorgan Chase  IBM  Kony Labs  Keystone  ebay  TIAA Financial Services  Ancestry   Rakuten      basic        frequent

Try 3 Question(s) Test


 Q3. How can we run a java program without making any object?Core Java
Anonymous
Ans. By putting code within static method. With Java 6 and earlier versions, even static block can be used.

  Sample Code for static block

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

   Like      Discuss      Correct / Improve     java   oops   static   static method   static block     American Express  Cognizant (CTS)      basic        frequent

Try 1 Question(s) Test


Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture.
  Q4. What is the difference between final, finally and finalize() ?Core Java
Admin
info@buggybread.com
Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing.

finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc.

finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state.

  Sample Code for final

  Sample Code for finally

  Sample Code for finalize

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


   Like      Discuss      Correct / Improve     java   oops   final   finally   finalize     Thomson Reuters  WITS  Antra  Jive  MorningStar  VanGuard   Alcatel Lucent  Morningstar  A9.com  EPAM  Nuance  SirsiDynix  NCR  VanGuard  Proofpoint Interview  Disney  Orbitz Worldwide  GFI Informatique  Canon  WITS  Simba Technologies  Marlabs  American Well  Global Relay  L&T Infotech  HCL Technologies  Tata Consultancy (TCS)  Wipro  Infosys  Accenture  Jive  Salesforce  Deegit  NTT DATA  Proofpoint  Morningstar  Bank Of America  Manhattan Associates  Optum  NorthPoint  Nok Nok Labs  Simba Technologies   Rhino Africa  Solutionreach  V Soft Consulting  EBay  Cognizant (CTS)  IBM  ExactTargetKewill  CV Holdings  Symphony  Cubic Web solutions  Star International  FatWire  Mindteck  Dark Horse  TrueCaller      basic        frequent

Try 4 Question(s) Test


Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q5. 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

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


   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

Try 1 Question(s) Test


Frequently asked in Cognizant ( Based on 2 feedback )
  Q6. What are Inner , Outer , Left and Right Joins in SQL ?Database2017-01-09 13:07:55

Ans. Inner join is the intersection of two tables on the condition defined by the where clause i.e will get records from both tables matched by a column.

Outer join is the union of two tables i.e will get all records from both tables and will put null in the columns where related records are not present.

Left Outer join is the left union of two tables i.e all records from the table on the left and values from the right table for related records else null for the columns from right table.

Right Outer join is the right union of two tables i.e all records from the table on the right and values from the left table for related records else null for the columns from left table.

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


   Like      Discuss      Correct / Improve     sql  inner join  outer join  right join  left join     EPAM  Antra  MSCI  HCL Technologies  Cognizant (CTS)  Morgan Stanley  Wipro  Infosys  Accenture  IBM  PayPal  A9.com  Curriculum Associates  Gold Coast IT  Kobie Marketing  Hybris  Aptroid Technologies  E2open  IGATE  SnapDeal  Verilogue  Span Infotech      basic        frequent


Frequently asked question in companies using hibernate.
  Q7. Difference between first level and second level cache in hibernate ?Hibernate
Admin
info@buggybread.com
Ans. 1. First level cache is enabled by default whereas Second level cache needs to be enabled explicitly.

2. First level Cache came with Hibernate 1.0 whereas Second level cache came with Hibernate 3.0.

3. First level Cache is Session specific whereas Second level cache is shared by sessions that is why First level cache is considered local and second level cache is considered global.

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


   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   architecture   technical lead     EFI  Geometric  QuinStreet  Cognizant (CTS)  ZS Associates  Walt Disney      Intermediate        frequent


  Q8. Explain OOPs Core Java2017-06-13 08:25:45

Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protected
4. Polymorphism for flexibility and interfacing

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

   Like      Discuss      Correct / Improve     oops  oops features     Trimax IT Infrastructure & Services  Aricent  HCL Technologies   Tata Consultancy (TCS)  Infosys  Cognizant (CTS)      basic        frequent


Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)
 Q9. What is the use of hashcode in Java ?Core Java
Anonymous
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not.

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


   Like      Discuss      Correct / Improve     java   collections   hashcode   advanced  hashtable     Cognizant (CTS)  Compro Technologies  VigLink  Proofpoint  Accolite      intermediate        frequent

Try 1 Question(s) Test



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



Frequently asked to fresh graduates and less experienced.
 Q10. Why do we write public static void main ? Can we use some other syntax too for main ?Core Java
Admin
info@buggybread.com
Ans.
1. public is the access modifier that makes the method accessible from anywhere, static is the keyword that makes it accessible even without creating any object and using class name only , void means it doesnt return anything , String args[] is the array of argument that this method receives.

2. If I use Main , it will compile correctly as Java will treat it as just another method but it wont be the method "main" which Java looks for when it looks to execute the class and hence will throw

Error: Main method not found in class , please define the main method as:
public static void main(String[] args)

3. Main is not a keyword but a special string that Java looks for while initiating the main thread.

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


   Like      Discuss      Correct / Improve     java   main method     Cognizant (CTS)  Computer Solutions & Software International (CSSI)  Telcoinabox  IBM Pune      basic        frequent

Try 1 Question(s) Test


Frequently asked to fresh graduates and less experienced developers.
 Q11. Explain multithreading in Java ?Core Java
Anonymous
Ans. 1. Multithreading provides better interaction with the user by distribution of task

2. Threads in Java appear to run concurrently, so it provides simulation for simultaneous activities.The processor runs each thread for a short time and switches among the threads to simulate sim-ultaneous execution (context-switching) and it make appears that each thread has its own processor.By using this feature, users can make it appear as if multiple tasks are occurring simultaneously when, in fact, each is running for only a brief time before the context is switched to the next thread.

3. We can do other things while waiting for slow I/O operations.In the java.iopackage, the class InputStreamhas a method, read(), that blocks until a byte is read from the stream or until an IOExceptionis thrown. The thread that executes this method cannot do anything elsewhile awaiting the arrival of another byte on the stream.

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

   Like      Discuss      Correct / Improve     java   threads   multi threading  concurrency   multithreading     Hamsini ECommerce   Cognizant (CTS)  Cumulus Systems  Cognizant (CTS)      intermediate        frequent

Try 1 Question(s) Test


Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q12. Differences between abstract class and interface ?Core Java
Admin
info@buggybread.com
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.

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


   Like      Discuss      Correct / Improve     java   classes   abstract class   interfaces     GlobalLogic  HCL Technologies  Tata Consultancy (TCS)  Infosys  Wipro  Mindtree  CapitalOne  Accenture  IBM India  Infoview Technologies  Salesforce  AT&T  United Health Group (UHG)  Verilogue  Amazon  Expeditors  Syntel  SalesForce  Cornerstone OnDemand  Expedia  OLA  NSF International  Copper Mobile  Think Future Technologies  MorphoTrust  Global Healthcare  Prodigious  Internet Brands  SciQuest  arvato Systems  iCIMS  Ideas2IT  virtusa polaris  Vitech Systems  Cognizant (CTS)  Speridian Technologies  Ojas Innovative Technologies  SWC Technology Partners  Cricbuzz  Jean Martin  Capgemini  Virtusa  ECI Telecom   Aptify   Crossover  ample softech  Metanoia software solutions  Overstock.com  Unic Sol India  Experis India  Intellect Design Arena  Sarathi Softech  Transorg Analytics  Cibersites India  Resource Weaver  Indium Software  Kone Elevator  Merkur Gaming  Prama Hikvision  Gurucul Solutions  e-Zest Solutions  ReadMind Info Services      basic        frequent


Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q13. What is Dependency Injection or IOC ( Inversion of Control ) ?Design

Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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

   Like      Discuss      Correct / Improve     design patterns   ioc ( Inversion of Control )  dependency injection     Nucleus Software Exports  HCL Technologies  Tata Consultancy (TCS)  HCL  Infosys  Cognizant (CTS)  Barclays  General Electric  Infosys Technologies  Elsevier  Sabre  ZapCom  Nike  Sogeti  CSG International  Lowes  DWS  Mitsui Bussan Logistics  Payment Processing Partners  Liquidnet  AmTrust Financial  VectorForm  Cybage  Vanderbilt University  Cigniti  Accenture  Ball Aerospace  GE Healthcare  1-800 Contacts  VinSolutions  Arrow Electronics  Monitise  Avenue Code  Thetus Corporation  Shodogg  Levi9  BuildLinks  Suyati Technologies  Kanerika Software  Alliance Inspection Management  Promega  Victorious  Zoll Data Systems  Parkmobile  PerceptiMed  Crate and Barrel  Carbonite  Concur  Codazen  GlobalLogic  AccuSoft  Attinad  Tillster  AppRiver  TrustPilot  Pearson  Kony  Art Technology Group  VeriSign  Accion Labs  IGS Energy  National Bankruptcy Services  RealPage  Green Dot  Indecomm Global  bebo Technologies  Open Solutions  Xoriant  NCR  Macmillan Cancer Support  NetSuite  Asynchrony Labs  DealDash  Vizio  Fiserv  Federal Reserve Bank of Minneapolis  Tinder  FICO  Trustwave      intermediate        frequent


 Q14. Can you give a real world example of Encapsulation and Abstraction ?Core Java2016-05-29 13:47:31

Ans. Car Engine is an example of encapsulation and abstraction. You ignite the car using an interface called starter and least bothered about how the tire actually moves (This is abstraction). The engine encapsulates the complete process to itself only and doesn't allow you to start the other components like the radiator etc ( this is excapsulation )

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

   Like      Discuss      Correct / Improve     encapsulation  abstraction  oops  oops features  java features     MAQ Software  Daffodil Software  Quickstart Global  Alliance Global Services  InfoStretch  Intelligrape  Prowareness  Support.com  Cognizant (CTS)  BNT SOFT  Clairvoyant TechnoSolutions  Suyati Technologies  3DPLM Software Solutions


Frequently asked. Among first few questions in the J2EE segment of interview.
  Q15. What is deployment descriptor ?

or

What is the use of deployment descriptor ?
Java EE2016-06-04 22:46:40

Ans. Deployment Descriptor which is usually web.xml is used to specify the classes, resources and configuration of the application and how the web server uses them to serve web requests.This file is usually added to WEB-INF folder and contains following

* Servlet entries and url mapping
* Plugins
* Some info regarding authentication / filters
* Landing Page
* Event Handlers

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

   Like      Discuss      Correct / Improve     web.xml   servlets  deployment descriptor     The NewBury Corp  Fast Dolphin  uCertify  General Electric  Cognizant (CTS)  Web coop  HCL Technologies  Tara Consultancy (TCS)  Wipro  Infosys  Cognizant (CTS)  Sonatype  IBM  computer science corporation (CSC)  American Express      basic        frequent

Try 1 Question(s) Test


Frequently asked in Tech Mahindra ( Based on 3 inputs )
  Q16. What is the difference between List, Set and Map ?Core Java
Anonymous
Ans. List - Members are stored in sequence in memory and can be accessed through index.
Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates.
Map - Contains Key , Value pairs.

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

   Like      Discuss      Correct / Improve     java   collections   list   set   map     Cognizant (CTS)  Ebay   Infosys   HCL Technologies   Tech Mahindra  Cumulus Systems  Mindteck  American Express      basic        frequent

Try 1 Question(s) Test


Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q17. Difference between Overloading and Overriding ?Core Java
Anonymous
Ans. Overloading - Similar Signature but different definition , like function overloading.

Overriding - Overriding the Definition of base class in the derived class.

  Sample Code for overloading

  Sample Code for overriding

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

   Like      Discuss      Correct / Improve     java   oops   overloading   overriding   oops concepts   basic interview question     PC Technology  Cognizant (CTS)  Donlen   hybris Software  RedMane  Allerin Technologies  Gemalto  Allerin Technologies  HCL Technologies  Tata Consultancy (TCS)  Accenture India  Infosys Technologies  Polaris  United Healthcare India  IBM India  Xchanging  American Express  Antra  Flipp  Computer Sciences Corporation (CSC)  Garmin  NetSuite  Donlen  Hudsons Bay  Techlogix  SevOne  Synactive  Oodles Technologies  FDM Group  Marlabs  RedMane Technology  Faichi Solutions  TD  Tech Mahindra  Shutterfly  Luxoft  PC Technology  CCC Information Services  State Farm  Raja Software  Mastek  EPAM  Morgan Stanley  SummitWorks  Sony  Citibank  Emtec  LowerMyBills  Consilience  Xavor  AllState  FasTrak  AmTrust Financial  Walt Disney  Ultramain Systems  International Turnkey Systems  Knoldus Software  CA Technologies  Amdocs  FDM Group  Hybris  Fidelity  United Health Group (UHG)  Bluewhale Solutions  Pegasystems  Revature   Innoplexus  Vanguard  AptSource  Perficient  Grapecity  Subex  QuintilesIMS  NimbleUser  Expeditors Associate  Sapient  HR Cloud  Summitworks  Jabong.com  Kony Labs  Price Waterhouse Coopers (PWC)      basic        frequent

Try 1 Question(s) Test


  Q18. What is Serialization ? Why do we need it ?Core Java
Anonymous
Ans. Storing the state of an object in a file or other medium is called serialization.

Classes can communicate only if they are built together ( as they need Byte code for communication ). What if we need to enable communication between different applications ( i.e they have been built independently or even they reside at different locations ), We need a mechanism that will transfer the Bean state to a Medium than can be transferred to the receiving application.

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


   Like      Discuss      Correct / Improve     java   oops   serialization     Computer Sciences Corporation (CSC) India   Tieto  Uproar  Priceline.com  HCL Technologies  Cognizant (CTS)  Hewlett Packard (HP)  Mphasis  Infosys Technologies  Global Logic  Microsoft      basic        frequent

Try 1 Question(s) Test


Frequently asked to fresh graduates.
 Q19. Explain Thread States ?Operating System
Admin
info@buggybread.com
Ans. Runnable - waiting for its turn to be picked for execution by the thread schedular based on thread priorities.

Running - The processor is actively executing the thread code. It runs until it becomes blocked, or voluntarily gives up its turn.

Waiting: A thread is in a blocked state while it waits for some external processing such as file I/O to finish.

Sleeping - Java threads are forcibly put to sleep (suspended) with Thread.sleep. they can resume using Thread.resume method.

Blocked on I/O - Will move to runnable after I/O condition like reading bytes of data etc changes.

Blocked on synchronization - Will move to Runnable when a lock is acquired.

Dead - The thread is finished working.

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

   Like      Discuss      Correct / Improve     java   threads   multi threading   scheduling   thread states   basic interview question     Cognizant (CTS)      basic        frequent

Try 2 Question(s) Test



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



Very frequently asked in companies using SOA.
  Q20. What are RESTful Web Services ?Rest
Admin
info@buggybread.com
Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines -

1. http for client server communication,
2. XML / JSON as formatiing language ,
3. Simple URI as address for the services and,
4. stateless communication.

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

   Like      Discuss      Correct / Improve     java   web services   rest   java   j2ee  architecture     Synechron  CapitalOne  Overstock.com  Ebay  At&t  HCL Technologies  Barclays  Tata Consultancy (TCS)  Cognizant (CTS)  Wipro  Infosys  EPAM  Mphasis  verchaska infotech      intermediate        frequent


 Q21. What are the contents of Hibernate configuration file ( hibernate.cfg.xml ) ?Hibernate
Admin
info@buggybread.com
Ans. HBM Files ( Mapping )
DB Connection ( DB Connection String , User Name , Password , Pool Size )
SQL Dialect ( SQL variant to be generated )
Show SQL ( Show / No show SQL on Console )
Auto Commit ( True / False )

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

   Like      Discuss      Correct / Improve     hibernate   configuration   barclays     Mphasis  Mccoy Global Links  Availity  Infosys  GlobalLogic  Cognizant (CTS)  Overstock.com  Erricson  Erricson India  HCL Technologies  Tata Consultancy (TCS)


Very Frequently asked.
 Q22. Explain throw, throws , try and catch in Java ?Core Java
Admin
info@buggybread.com
Ans. throw is used to re throw an exception.

throws is used to declare that the method throws the respective exceptions.

try block is used to identify if the respective block has thrown any exception.

catch is used to catch the exception that has been thrown by the respective try block.

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

   Like      Discuss      Correct / Improve     java   exception handling   throw   throws   try   catch     Vidram Solutions  Cognizant (CTS)      basic        frequent


  Q23. Difference between GET and POST Requests ?Web Service2016-07-22 15:00:21

Ans. GET is supposed to get information from the server. Client sends the minimal information so that Server can respond with the response body on basis of request. For example - You want to get complete employment record for employee id 123

POST is supposed to send the information for submission. Payload or a Body is usually sent so that it can be persisted on the server. For example - Sending the complete information of an employee ( id, name , dept etc ) to the server for persisting it.

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

   Like      Discuss      Correct / Improve     get vs post   web service   rest     Wayfair  Finacus Solutions  Elsevier  Cognizant (CTS)  FlipKart  Singsys  Overstock  One Click Retail  Spillman Technologies  HCL Technologies  Infosys Technologies      basic        frequent


 Q24. Different ways of implementing Threads in Java ?Core Java
Anonymous
Ans. Threads in Java can be implement either by Extending Thread class or implementing runnable interface.

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

   Like      Discuss      Correct / Improve     java   threads   multi threading     Cognizant (CTS)      basic        frequent


 Q25. 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

Try 2 Question(s) Test


Very frequently asked. Usually asked with questions related to String.
  Q26. What is an Immutable Object ?Core Java
Anonymous
Ans. Object that can't be changed after instantiation.

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

   Like      Discuss      Correct / Improve     java   oops   immutable     LiveSocialize Technologies  Oracle  Bureau Veritas  AudioCodes  GCPL Technologies  Infogain  Goldman Sachs  JP Morgan  Incture Technologies  Novell  Amisoft Technologies  Xactly Corp  Amisoft Technologies  Sunrun  Cognizant (CTS)  Hortonworks  AdNovum  Aquent   V-Soft  Sears  Idexcel  Infusion  Knight Capital  Bally Technologies  Yatra Online  Multivision (Virginia)  Portware LLC      basic        frequent

Try 2 Question(s) Test


Very Frequently asked. Usually asked along with String Class related questions.
  Q27. What is an immutable class ?Core Java
Anonymous
Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created.

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

   Like      Discuss      Correct / Improve     java   oops   immutable   immutable class   string class   basic interview question     Cognizant (CTS)  Hybris  YuMe  ebizAutos  Deloitte  HCL Technologies  Tata Consultancy (TCS)  Infosys  Accenture  Overstock.com  Elsevier  Endurance International Group  SynergisticIT  Verizon  Capgemini  Ebay      Basic        frequent

Try 2 Question(s) Test


 Q28. Explain Autoboxing ?Core Java
Anonymous
Ans. Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes

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

   Like      Discuss      Correct / Improve     java   java5   autoboxing   wrapper classes     Cognizant (CTS)      basic        frequent


 Q29. Is it necessary that each try block to be followed by catch block ? Core Java
Anonymous
Ans. It should be followed by either catch or finally block.

  Sample Code for Retry in case of exception

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

   Like      Discuss      Correct / Improve     java   exceptions   exception handling   try   catch   finally  Oracle OCA Test     Accenture  Cognizant (CTS)      basic        frequent

Try 1 Question(s) Test



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



 Q30. What is PermGen or Permanent Generation ?Core Java
Admin
info@buggybread.com
Ans. The memory pool containing all the reflective data of the java virtual machine itself, such as class and method objects. With Java VMs that use class data sharing, this generation is divided into read-only and read-write areas. The Permanent generation contains metadata required by the JVM to describe the classes and methods used in the application. The permanent generation is populated by the JVM at runtime based on classes in use by the application. In addition, Java SE library classes and methods may be stored here.

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

   Like      Discuss      Correct / Improve     java   jvm   memory management   permgen   permanent generation   advanced   architecture     JP Morgan  SAP  Informatica  Credit Agricole  EXFO  EMC  Credit Agricole  Cognizant (CTS)  JP Morgan      expert


  Q31. What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?
Database2016-06-30 20:13:35

Ans. When a Table Join itself , it's a Self Join. For example - we like to know the pair of department names where first dept has lesser employees than the later.

Select D1.name , D2.name from Dept D1, Dept D2 where D1.employee_count < D2.employee_count

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

   Like      Discuss      Correct / Improve     sql  joins  self join  self-join  Pair of employee names with first having lesser salary than later  Pair of department names where first dept has lesser employees than the later     Accenture  West Monroe Partners  Oracle  eBay  Impetus Technologies  Bank of America  Fannie Mae  Wize Commerce  Kleward Consulting  Pyramid Consulting  Interra Information Technologies  Trigent Software  Xtreme Media  IGATE  Nagarro  Six Sigma  Nityo Infotech  Fujitsu  BlazeClan  Twist Bioscience  Invoyent  Cognizant (CTS)  i2c  Capgemini      basic        frequent


Frequently asked at HCL Technologies ( Based on 3 feedback )
  Q32. Difference between Checked and Unchecked exceptions ?Core Java
Anonymous
Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked.

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

   Like      Discuss      Correct / Improve     java   exceptions   checked exceptions   unchecked exceptions   exception handling   basic interview question     Verilogue  F5 Network  Pegasystems  PegaSystems  SAP  Ciber  Conde Nast  Pramati Technologies  IBM  JP Morgan  HCL Technologies  Tata Consultancy (TCS)  Cognizant (CTS)  Cogent Infotech  MarketAxess  defense group  NETS INTERNATIONAL  Accenture  Integra Micro  ColdLight Solutions  Endeavor  Deloitte  Infosys  Jean Martin  Symantec  Ancestry  Overstock.com  Adobe  Ultimo  CRIF  Sapeins  Flexera  Sofi  Morgan Stanley  Barclays      basic        frequent

Try 1 Question(s) Test


Frequently asked.
  Q33. What is an Iterator?Core Java
Anonymous
Ans. Iterator is an interface that provides methods to iterate over any Collection.

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

   Like      Discuss      Correct / Improve     java   collections   iterator     Magic Software  Maverick Software  Wipro  IBM  HCL Technologies  Tata Consultancy (TCS)  Cognizant (CTS)  Wipro  Accenture  American Express      basic        frequent


 Q34. What are transient variables in java?Core Java
Anonymous
Ans. Transient variables are variable that cannot be serialized.

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

   Like      Discuss      Correct / Improve     java   serialization   transient     Cognizant (CTS)   American Express   HCL Technologies   Tata Consultancy (TCS)  Accenture  Erricson  Global Logic      intermediate        rare


Usually asked only to fresh graduates.
 Q35. What is the initial state of a thread when it is created and started?
Anonymous
Ans. Ready state.

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

   Like      Discuss      Correct / Improve     operating system   threads   multi threading   java   thread states     Cognizant (CTS)      basic        frequent


  Q36. what is the difference between collections class vs collections interface ?Core Java
Admin
info@buggybread.com
Ans. Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.

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

   Like      Discuss      Correct / Improve     java   collections   collections class   collection interface   basic interview question     Cognizant (CTS)  HCL Technologies  Infosys  Mphasis  NTT Data  Capgemini      basic        frequent

Try 1 Question(s) Test


Frequently asked in CTS ( Based on 2 feedback )
  Q37. 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.

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

   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


 Q38. Explain Method Local Inner Classes ?Core Java
Admin
info@buggybread.com
Ans. You can create a non-static local class inside a body of code. Interfaces cannot have local classes, and you cannot create local interfaces.

Local classes are accessible only from the body of the code in which the class is defined. The local classes are completely inaccessible outside the body of the code in which the class is defined.

You can extend a class or implement interfaces while defining a local class.

A local class can access all the variables available in the body of the code in which it is defined. You can pass only final variables to a local inner class.

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

   Like      Discuss      Correct / Improve     java   oops   inner classes   local classes   classes   method local inner classes     Cognizant (CTS)


 Q39. What is connection pooling?Database
Admin
info@buggybread.com
Ans. It's a technique to allow multiple clients to make use of a cached set of shared and reusable connection objects providing access to a database or other resource.

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

   Like      Discuss      Correct / Improve     java   jdbc   db connectivity   connection pooling   architecture     Cognizant (CTS)  IGATE  eMeasurematics      basic        frequent



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



  Q40. What is the use of HashCode in objects ?Core Java
Admin
info@buggybread.com
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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

   Like      Discuss      Correct / Improve     java   string   hashcode   hash code   string comparison  hashtable     Verilogue  Deutche bank  Kasmo Cloud Solutions   Collabera  Virtusa Consulting  CenturyLink  HCL Technologies  Tata Consultancy (TCS)  Accenture  Polaris  Amdocs  Cognizant (CTS)  IBM  nagarvision   Synechron  Global Logic      basic        frequent


next 40


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus
 

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked:
         

X Close this

X Close this

Help Us Improve.
Please share your
interview experience.

Company Name:   


Questions Asked: