Advance & Core Java Interview Question and Answers | Search Java Coding Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Interview Questions


 3152 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 Question and Answers - 3152 question(s) found - Order By Newest

next 40
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

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


   Like      Discuss      Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     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  Amdocs  T & A Hr Solutions  End2End Catalyst  Code Garage Tech  IQuest Management Consultants  Indianmesh pvt ltd  Netsmartz  Meander Software  UrbanPro.com  Netrovert Software  T & A Hr Solutions  Zscaler  Maven Wave Partners  Basware India  Emerson  GCE solutions  SmartData Enterprise  Shivark Virtual Academy  FinXera  Sampoorna Consultants  Samridhi  KKA Technologies  bebo technologies  Closeloop Technologies  DamcoSoft  Swar Yantra Technologies  SK VedaInfo Universal  Trantor Software  IT HAT Consulting  Kindlebit Solutions  Mann McGlynn  AmrtData Enterprises  Riconz Technologies  Embryo Software Solution  Corporate Stalwarts  Varite  Mirror Consultancy Service  Wing Global IT Service  Regence  Adpearance  IGNW  Centizen  Flexton  Syntel  Kaiser Permanente  SkiData  New Relic  McKesson  Finastra  Pivotal  UST Global  Morgan Stanley  Kroger  Genesys  Guardian Life  SynergisticIT  Leidos  Expeditors Associate  Polycom  Compass  Point ClickCare  Expedia  Equal Experts  Dimentrix  Intellect Design Arena  Epam Systems  Qualys  Instacart  ThoughtWorks  Maxgen Technologies  Aayansh Germinate  Principal Financial Group  NineScript Technologies  Nihilent  infrasoft technologies  e-Zest Solutions  Krawler Inc  FundTech  BNT SOFT  SAPsphinx Infotech  KinderTouch  Accede Software Solutions  LeadLake  Emerson  Xoriant  Citrix  Anonymous Content  GS Lab  Thermax  Saama Technologies  Fresherworld.com  Nityo Infotech  Sanofi  Innoplexus  Sears IT & Management Services   National Stock Exchange of India  Accelya Kale  Tudip Technologies  ITSource Technologies  Sela Technology Solutions  Eternus Solutions  Raja Software Labs  Leo TechnoSoft  Shubham Housing Development Finance  Serene Corporation  Leo Technosoft  Questionpro  Sparken IT Solutions  Capsilon  JetSynthesys  MangoSpring  Subway  Arezzo Sky  Lenco Diagnostic Laboratories  Finlogic Technologies  Maxxton  Cerillion  Applus+  XOYAL  Acloudzyn Technologies  ITYX  Tej IT Solutions  Transworld Compressor Technologies  Deskera  Ebaotech  Kahuna Systems  Kimaya Infotech  SSP Technology  Boston Byte  Bonellisoft  Rack Infotech  Intellection Software and Technologies  OMVSAB IT Solutions  ProductDossier  Soft Infology  Systems Plus Transformations  StackMint  HeadInfotech India  EffortSys  KasNet Technologies  Java City  iSynergy TechSys  Unisoft Technologies  Servient  ThinkQuotient Software  Medline Industries  Ascent Cyber Solutions  Proto-T Solutions  Tinker Technologies  Censhare  Proto-T Solutions  Henx International Technologies  AlightHub Consulting Services  Perpetual Infotech  BestoSys  Infiniti Infosystems  Torqus  Spectrum Tech System  OreInfo  Sanvi Softech  Neptune Solutions  XTime  Web Hub Technology  Coin Technologies  Paramount Pictures  Rocklike DMS  Implant Technosoft Solutions  Nabla Infotech  Predikly  Godwit Technologies  Kanaka Consulting  Aarnum Technologies  Ganesh Kapure  Abhinav Digicompsoft Services  Shoffex.com  Online Training Solutions  A Plus Tree  OMM Software Innovation  Tanish Infotech Solution  Zinist Software  Mobile Sutra  Playpixel Infosystem  SunGuard  Nihilent  Siemens PLM Software  Maxgen Technologies  Nitor Infotech  Mediaocean  Yagna iQ  Sigma Systems  Ethon  The Permanente Medical Group  Reliance Industries  MindCraft Software  ABM Knowledgeware  Trutech Web Solutions  Nikhil R Gupta & Associates  eMeasurematics  NovelERP Solutions  Web Element Solutions  HDFC Bank  Qualcomm  Intellect Design Arena  Diebold Nixdorf  Sharekhan  Pepperfry  IRIS Business Services  Wind World  ZEDO  Loylty Rewardz Mngt  C2L Biz  Chenoa Information Services  Insolutions Global  Vakrangee Softwares  Celusion Technologies  Currencies Direct  Zenith System Solutions  Base Information Management  Exponentia DataLabs  Realty Redefined  Constaccent  Neoquant Solutions  Aureus Analytics  Planfirma Technologies  Pawaa Software  iBhejo  Fairfax County Virginia  American Conservation Experience  Hari Krishna Exports  Core Education & Technologies   Nishat Mills  Industrial Market Place  Krisnela Technologies  Swissclear Global  Samyak Software  Professional Access  Nexstep Infotech  Concerto Software  Viral Technologies  Silverwing Technologies  Gcom Software Inc  Accel Frontline  Atom Technologies  Blue Star Infotech  Cynapse  Datamatics Global Services  Flytxt Mobile Solutions  Persistent Systems  Onmobile Global  Trianz  Sasken  WNS Global Services  Tavant technology  Edz Infomatics      basic        frequent

Try 6 Question(s) Test


Advanced level question. Frequently asked in High end product companies. Frequently asked in Cognizant and Deloitte ( Based on 2 feedback )
  Q2. 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  immutability   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)
  Q3. 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  Accenture  Accenture India  QualiTest Group  CDK Global  InfoGain  Mindfire Solutions  Shopify  Tk20  AppKnox  RedMane Technology  Fidelity      basic        frequent

Try 3 Question(s) Test


Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews.
  Q4. What are the difference between composition and inheritance in Java?Core Java
Admin
info@buggybread.com
Ans. Composition - has-a relationship between objects.
Inheritance - is-a relationship between classes.

Composition - Composing object holds a reference to composed objects and hence relationship is loosely bound.
Inheritance - Derived object carries the base class definition in itself and hence its tightly bound.

Composition - Used in Dependency Injection
Inheritance - Used in Runtime Polymorphism

Composition - Single class objects can be composed within multiple classes.
Inheritance - Single class can only inherit 1 Class.

Composition - Its the relationship between objects.
Inheritance - Its the relationship between classes.

  Sample Code for inheritance

  Sample Code for composition

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


   Like      Discuss      Correct / Improve     java   java concepts   inheritance  object oriented programming (oops)  oops concepts   composition  object oriented programming (oops)  oops concepts   inheritance  object oriented programming (oops)  oops concepts vs composition  object oriented programming (oops)  oops concepts     HCL Technologies  Tata Consultancy (TCS)  Infosys  Amazon  Source Intelligence  News UK  Starmount  MapQuest  SalesForce  Expedia  Deegit  JP Morgan  Canva  Todle  Yodle  Berkley Net  Help Scout  Partners HealthCare  Doximity  Commvault  Heroku  Starmount  Help.com  healthcare system  TU Kaiserslautern  Epam      basic        frequent

Try 5 Question(s) Test


  Q5. Which are the different segments of memory ?Core Java
Anonymous
Ans. 1. Stack Segment - Contains primitives, Class / Interface names and references.

2. Heap Segment - Contains all created objects in runtime, objects only plus their object attributes (instance variables), Static variables are also stored in heap.

3. Code Segment - The segment where the actual compiled Java bytecodes resides when loaded

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

   Like      Discuss      Correct / Improve     java   memory   memory management   stack memory   heap memory   code segment memory   advanced     NX Developer  Velocity  Commvault  eBizprise Taiwan  Tata Consultancy (TCS)  Nakisa  HCL Technologies  Blue Coat  Symantec      expert        frequent

Try 6 Question(s) Test


 Q6. Does garbage collection guarantee that a program will not run out of memory?Core Java
Anonymous
Ans. Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection

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

   Like      Discuss      Correct / Improve     java   garbage collection   java memory management   advanced     HCL Technologies  TrueCaller

Try 1 Question(s) Test


 Q7. What are different ways to create String Object? Explain.Core Java
Admin
info@buggybread.com
Ans. When we create a String using double quotes, JVM looks in the String pool to find if any other String is stored with same value. If found, it just returns the reference to that String object else it creates a new String object with given value and stores it in the String pool.

When we use new operator, JVM creates the String object but dont store it into the String Pool. We can use intern() method to store the String object into String pool or return the reference if there is already a String with equal value present in the pool.

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

   Like      Discuss      Correct / Improve     java   string class   string   jvm   memory management   string pool     GuideWire  NTT Data  Fractal Analytics  Accolite      basic        frequent

Try 3 Question(s) Test


  Q8. What do you mean by "Java is a statically typed language" ?Core Java
Admin
info@buggybread.com
Ans. It means that the type of variables are checked at compile time in Java.The main advantage here is that all kinds of checking can be done by the compiler and hence will reduce bugs.

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


   Like      Discuss      Correct / Improve     java   statically typed language   variable declaration     Vanguard  Viasat  Natrix Technology  HCL Technologies  Accenture  Accenture India  Infosys      basic        frequent


 Q9. Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?Core Java
Admin
info@buggybread.com
Ans. Yes, we can substitute outer classes wherever we need to have inner classes but Inner classes have advantage in certain cases and hence preferred -

Ease - Why to implement a class outside if its objects are only intended to be part of an outer object. Its easy to define the class within another class if the use is only local.

Protection - Making a call an outer exposes a threat of it being used by any of the class. Why should it be made an outer class if its object should only occur as part of other objects.

For example - You may like to have an class address whose object should have a reference to city and by design thats the only use of city you have in your application. Making Address and City as outer class exposes City to any of the Class. Making it an inner class of Address will make sure that its accessed using object of Address.

  Sample Code for inner class

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


   Like      Discuss      Correct / Improve     java   inner classes   classes   objects   technical lead      intermediate

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



 Q10. Why Char array is preferred over String for storing password?Core Java
Admin
info@buggybread.com
Ans. String is immutable in java and stored in String pool. Once it's created it stays in the pool until unless garbage collected, so even though we are done with password it's available in memory for longer duration and there is no way to avoid it. It's a security risk because anyone having access to memory dump can find the password as clear text.

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

   Like      Discuss      Correct / Improve     java   string class   string   immutable  immutability   string pool   garbage collection   advanced     General Motors  Amura Marketing Technologies  Bloomberg  Innovive      Expert


Frequently asked in Infosys and HCL Technologies ( Based on 2 feedback )
 Q11. What are different ways of object creation in Java ?Core Java
Admin
info@buggybread.com
Ans. Using new operator - new xyzClass()

Using factory methods - xyzFactory.getInstance( )

Using newInstance( ) method - (Class.forName(xyzClass))emp.newInstance( )

By cloning an already available object - (xyzClass)obj1.clone( )

  Sample Code for object initialization using clone

  Sample Code for object initialization using getInstance

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

   Like      Discuss      Correct / Improve     java   oops   object creation   new operator   class.forname   cloning   ebay     Intelligrape  Infosys  Polaris  British Telecom (BT)  Vyom Labs  Deutsche Bank  HCL Technologies   Genpact  Thomson Reuters      expert


 Q12. What are points to consider in terms of access modifier when we are overriding any method?Core Java
Admin
info@buggybread.com
Ans. 1. Overriding method can not be more restrictive than the overridden method.

reason : in case of polymorphism , at object creation jvm look for actual runtime object. jvm does not look for reference type and while calling methods it look for overridden method.

If by means subclass were allowed to change the access modifier on the overriding method, then suddenly at runtime when the JVM invokes the true objects version of the method rather than the reference types version then it will be problematic

2. In case of subclass and superclass define in different package, we can override only those method which have public or protected access.

3. We can not override any private method because private methods can not be inherited and if method can not be inherited then method can not be overridden.

  Sample Code for Overriding

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

   Like      Discuss      Correct / Improve     java   overriding   access specifier   inheritence   oops   polymorphism  object oriented programming (oops)  oops concepts   runtime polymorphism  object oriented programming (oops)  oops concepts     Genpact

Try 2 Question(s) Test


 Q13. What is the difference between declaration, instantiation and initialization ?Core Java2016-05-26 14:17:48

Ans. Declaration is intimation to the compiler about the nature of Data a reference is going to hold.

For example - List myList;

Instantiation is reservation of memory.

For example

myList = new ArrayList();

Initialization or construction is setting the default values for member elements.

For example

myList = new ArrayList(mySet);

** Example 2nd is both for instantiation as well as initialization. The only difference is that 2nd will initialized the member elements to their default values whereas 3rd will initialized it with the elements from set.


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

   Like      Discuss      Correct / Improve     declaration   instantiation   initialization   construction     Hewlett Packard (HP)      basic        frequent


 Q14. What are the common uses of "this" keyword in java ?Core Java
Anonymous
Ans. "this" keyword is a reference to the current object and can be used for following -

1. Passing itself to another method.

2. Referring to the instance variable when local variable has the same name.

3. Calling another constructor in constructor chaining.

  Sample Code for this keyword

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

   Like      Discuss      Correct / Improve     java   this   object reference   constructor chaining      intermediate        rare

Try 3 Question(s) Test


Very frequently asked to Fresh graduates.
  Q15. What is the difference between Encapsulation and Abstraction?Core Java
Anonymous
Ans. 1.Abstraction solves the problem at design level while encapsulation solves the problem at implementation level

2.Abstraction is used for hiding the unwanted data and giving relevant data. while Encapsulation means hiding the code and data into a single unit to protect the data from outside world.

3. Abstraction lets you focus on what the object does instead of how it does it while Encapsulation means hiding the internal details or mechanics of how an object does something.

4.For example: Outer Look of a Television, like it has a display screen and channel buttons to change channel it explains Abstraction but Inner Implementation detail of a Television how CRT and Display Screen are connect with each other using different circuits , it explains Encapsulation.

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

   Like      Discuss      Correct / Improve     java   oops   oops concepts   encapsulation  object oriented programming (oops)  oops concepts   abstraction   basic interview question     Synechron  Amazon  HCL Technologies  Tata Consultancy (TCS)  Wipro  Infosys Technologies  3DPLM Software Solutions  Ojas Innovative Technologies  John Deere  Mastek      basic        frequent

Try 2 Question(s) Test


  Q16. What is a Lambda Expression ? What's its use ?Core Java
Admin
info@buggybread.com
Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

  Sample Code for lambda

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


   Like      Discuss      Correct / Improve     java   java8   lambda expression   architecture     Axxess  CACI  ZonOff  Dell India  Wellington Management  N26  Lithium Technologies  DST Systems  Overstock  Sofi  JP Morgan  HCL Technologies  Infosys  Wipro  Accenture  Accenture India  Eurofins  Yodlee  AvenData GmbH  Sapient Global Markets  Walmart  Ebay  Goldman Sachs  Foundation Software  HSBC Holdings  Wells Fargo  Marlabs  ZooPlus  Elastic Path  CardConnect  WealthFront  WorldAware  SpredFast  Mobileum  eGym  EnelX  Kroger  GFT Technoligies  Tyro Payments  Mindtree  KocharTech  Bharti Airtel  Tech Mahindra  Patni Computers  L&T Infotech  Mphasis  Mindtree  Hexaware  Collabera  3i Infotech  IGate  Kpit Technologies  NIIT Technologies  Trianz  Persistent Systems  IT Asset  1-800 contacts      expert        frequent

Try 1 Question(s) Test


 Q17. What are different types of classes ?Core Java

Ans. There are different verticals in which Java Classes can be classified.

1. Access - Public , Private , default or Protected.

2. Packaging - System, library or User Defined

3. Structure - Outer or Inner

4. Object Derivation - Abstract Class or Concrete Class.

5. Object Creation - Normal, Singleton , Doubleton , Immutable or Enum.

6. Functionality - String , Util , Stream etc.

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

   Like      Discuss      Correct / Improve     classes   different types of classes     iFactor

Try 1 Question(s) Test


 Q18. What are the benefits of JSON over XML ?Json
Anonymous
Ans. Lighter and faster than XML as on-the-wire data format

Object Representation - Information is presented in object notations and hence better understandable.

Easy to parse and conversion to objects for information consumption.

Support multiple data types - JSON supports string, number, array, boolean whereas XML data are all string.

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

   Like      Discuss      Correct / Improve     json   markup language     QualiTest      intermediate        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.
  Q19. 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  Accenture India  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   marlabs  Proofpoint      basic        frequent

Try 4 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.
 Q20. If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?Core Java
Admin
info@buggybread.com
Ans. ArrayList are implemented in memory as arrays and hence allows fast retrieval through indices but are costly if new elements are to be inserted in between other elements. LinkedList allows for constant-time insertions or removals using iterators, but only sequential access of elements

1. Retrieval - If Elements are to be retrieved sequentially only, Linked List is preferred.

2. Insertion - If new Elements are to be inserted in between other elements , Linked List is preferred.

3. Search - Binary Search and other optimized way of searching is not possible on Linked List.

4. Sorting - Initial sorting could be pain but lateral addition of elements in a sorted list is good with linked list.

5. Adding Elements - If sufficiently large elements needs to be added very frequently ,Linked List is preferable as elements don't need consecutive memory location.

  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     java   collections   list   arraylist   linkedlist   difference between   architecture   data structure   ebay     ADP  General Atomics      basic        frequent

Try 2 Question(s) Test


Frequently asked question in companies using Hibernate.
  Q21. What is Lazy Initialization in Hibernate ?Hibernate
Admin
info@buggybread.com
Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

  Sample Code for Lazy Initialization

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


   Like      Discuss      Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   architecture     overstock.com  BridgePoint Technologies  Medgate  Dex Media  Diversant  Tieto  Oracle  Bank of America Merrill LYNCH  NEC Japan  HCL Technologies  Deloitte  Accenture  Accenture India  Infosys  Tata Consultancy (TCS)  Luxoft  Nvidia  Cority  Kumaran Systems  PubMatic  Deven Infotech  Tavant  Casenet  Azuga  Egen Solutions  Photon Infotech  Dun & Bradstreet  ITHAKA  EngineerBabu  Atos  Zycus  CPA Global  Zycus  Fareportal  Saxo Bank  NSF International   Publicis  Sapient Razorfish  Pratham Software  ATCS  Q3 Technologies  Metacube Software  A3Logics  Nagarro  Tech Mahindra  Patni Computers  L&T Infotech  Mphasis  Mindtree  Hexaware  Collabera  3i Infotech  IGate  Kpit Technologies  NIIT Technologies  Trianz  Persistent Systems  IT Asset  SkillTeam Consulting  KenQA Services  Career Infosystem  Savera IT Solutions  Miracle Corporate Solutions  MAKWIZ Technologies  Global Resources Consulting  Nastech Consulting  Best Infosystems  InnoData India  Career Trackers and Consulting  BR Raysoft Global  Brainwork TechnoSolutions  GroupFit Insurance Brokers  FlexSin Technologies  IRIS Software  FIS Global Business Solutions  TRH Consultancy Services  NexThoughts Software Technologies      Basic        frequent

Try 2 Question(s) Test


 Q22. Which of the following combination of keywords is illegal in Java ?

a. static and transient
b. transient and final
c. static and synchronized
d. abstract and final
Core Java
Anonymous
Ans. abstract and final

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

   Like      Discuss      Correct / Improve     java   java keywords     VirtusaPolaris  IVTL InfoView Technologies      basic


 Q23. 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


Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity.
  Q24. Explain Flow of Spring MVC ?Spring
Admin
info@buggybread.com
Ans. The DispatcherServlet configured in web.xml file receives the request.

The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller.

Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet.

The DispatcherServlet determines the view from the ModelAndView object.

Then the DispatcherServlet passes the model object to the View.

The View is rendered and the Dispatcher Servlet sends the output to the Servlet container.

Finally Servlet Container sends the result back to the user.

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

   Like      Discuss      Correct / Improve     j2ee   spring   mvc   frameworks   web applications   architecture     Accenture  Accenture India  fidelity  IBM India  Softtek  Tata Consultancy (TCS)  HCL Technologies  Pragiti Internet Technologies  Cognizant (CTS)  Tech Mahindra      Basic        frequent


Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q25. 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  Accenture India  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  General Atomics      Basic        frequent

Try 1 Question(s) Test


 Q26. What are the ways to avoid LazyInitializationException ?Hibernate
Admin
info@buggybread.com
Ans. 1. Set lazy=false in the hibernate config file.

2. Set @Basic(fetch=FetchType.EAGER) at the mapping.

3. Make sure that we are accessing the dependent objects before closing the session.

4. Force initialization using Hibernate.initialize

5. Using Fetch Join in HQL.

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

   Like      Discuss      Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   lazyinitializationexception   architecture     Squelch  Overstock.com

Try 2 Question(s) Test


  Q27. What is a String Pool ?Core Java
Anonymous
Ans. String pool (String intern pool) is a special storage area in Java heap. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference.

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

   Like      Discuss      Correct / Improve     java   oops   string   string class   string pool   heap memory     SAS Institute  Ariba  GuideWire  Harbinger  Oracle  Virtusa  Knoa  Polaris  GuideWire  HCL Technologies  Tata Consultancy (TCS)  Infosys  Technologent  MphasiS  Harbinger Group  Kony  Evergent  NTT Data  VMware  Markit  Ariba  Tech Mahindra  Bureau Veritas  InfoStretch  PTC Software  Mindtree  Centre for Internet and Society (CIS)  Trimax IT Infrastructure & Services  City National Bank (CNB)      intermediate        frequent

Try 2 Question(s) Test


 Q28. Can we use both "this()" and "super()" in a constructor ?Core Java
Anonymous
Ans. No, because both this and super should be the first statement.

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

   Like      Discuss      Correct / Improve     java   oops  this   super   constructor      intermediate        rare

Try 2 Question(s) Test


Frequently asked question in companies using hibernate.
  Q29. 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  Virtusa  JP Morgan  Awin  UrbanPro  Thomson Reuters  Azuga  HCL Technologies  Infosys  GoldenSource  Evoke Technologies  Intercontinental Exchange      Intermediate        frequent



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



 Q30. Why every object constructor automatically call super() in Object before its own constructors?Core Java
Admin
info@buggybread.com
Ans. Derived object carries the body of its class as well as the body of the parent class. Its body ( member elements ) is initialized using its own class constructor whereas the body ( member elements ) carried from the parent class are initialized using super class constructor. So In order to initialize the elements of the parent class before its own elements are even initialized, super is called.

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

   Like      Discuss      Correct / Improve     java   oops   constructor   super   inheritance  object oriented programming (oops)  oops concepts   inheritence     Itech      intermediate


Basic and Very Frequently asked.
  Q31. What is Polymorphism in Java ?Core Java2016-11-06 09:10:54

Ans. Polymorphism means the condition of occurring in several different forms.

Polymorphism in Java is achieved in two manners

1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas

2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

  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     polymorphism  object oriented programming (oops)  oops concepts  oops concepts     Credit Suisse  Unbounded Solutions  Microsoft   Google  Purch  HCL Technologies  Tata Consultancy (TCS)  Wipro  Mathworks  Accenture  Accenture India  ZonOff  ZapCom  Addteq  Priceline.com  Acute Informatics  Trimax IT Infrastructure & Services   USAA  HCL Technologies  FDM Group  AppEnsure  Inov8  TIAA  Revature  Lockheed Martin  ScotiaBank  Algorhythm Tech  Aurus  Xpanxion  Bitwise Pune  GS Labs  Bitwise India  CRIF  Saggezza  Synchrony  Micro Focus  Mindtree  Zycus  Capgemini  ZapCom Group  Infosys Technologies  SLK Group  Intuit Bangalore  Quickr  Comviva Technology  Altimetrik  IDEALINVENT Technologies  Kewill  coMakeIT  Vekomy Technologies  Eze Software  State Farm  Rolta  State Street  High Radius  Cerner  TIBCO  3i Infotech  Goldman Sachs  ITC  abhra  InteractCRM  Polaris  Naggaro  Siemens  Hexaware Technologies  Skillnet solutions  Logixal Solutions Mumbai  Naaptol Mumbai  Logixal Solutions  NSETECH  Mastek Mumbai  AppAmplify Noida  HexaView Technologies  Wipro  Wittybrains Software Technologies  Meenakshi Noida  Eastern Software Systems Noida  MediaAgility Gurgaon  Daffodil Software  Oracle Gurgaon  Kellton Tech Gurgaon  Bharti Airtel Gurgaon  IHS Markit Gurgaon  Sinew Gurgaon  Grappus Gurgaon  Erricson Gurgaon  Deloitte  Accenture  Accenture India  Tech Mahindra  Patni Computers  L&T Infotech  Mphasis  Mindtree  Hexaware  Collabera  3i Infotech  IGate  Kpit Technologies  NIIT Technologies  Trianz  Persistent Systems  IT Asset  FIA-US  VanGuard  General Atomics      Basic        frequent

Try 2 Question(s) Test


Frequently asked in Cognizant ( Based on 2 feedback )
  Q32. 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  Accenture India  IBM  PayPal  A9.com  Curriculum Associates  Gold Coast IT  Kobie Marketing  Hybris  Aptroid Technologies  E2open  IGATE  SnapDeal  Verilogue  Span Infotech      basic        frequent


  Q33. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about 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)  Capgemini  Blue Coat  Symantec  Deegit  Cerner   Verizon  Ancestry  Accenture  Accenture India  Lexis Nexis  Elsevier  Overstock  Sofi  DeCurtis  Appirio  GlobalLogic  Robert Bosch  Lexicon IT  Teleperformance  Ranosys Technologies  InfoObjects  LoginRadius  Pixere  GirnarSoft  In Time Tec  Konstant Infosolutions  Axtria  Infostretch  TatavaSoft  E2logyCroods Consolidates  Elegant MicroWeb  IndiaNIC Infotech  Surekha Technologies  Amnex InfoTechnologies  Wishtree Technologies  Apttus  Majesco  Techsosys  Virtusa  Gruppo Banca Sella  eNoah  Volante Technologies  Karomi  Urjanet  Full Creative  Uniphore Software Systems  Revature  Saggezza  DXC Technology  QBurst  Kott Software  Petrolink Services  RapidValue Solutions  Speridian Technologies  Fingent  Marlabs  Ixigo.com  Bravura Solutions  Amdocs  GSPANN Technologies  Healthkart  Hughes Systique  Prospecta  Fidelity  Mediology Software  Ksolves  InfoGain  Mindfire Solutions  Hays  R Systems  Netrix Technology  HexaView  PayTM  Suncore Microsystem  Remaxys  ANR Software  Impetus Technologies  WittyBrains  InnovationM  Diction Technology  Bhavna Corp  Bristlecone  Fiserv  Quovantis Technologies  InnovationM  Intelligrape Software  PayCraft  Nearbuy  WSE Group  Grappus  MAQ Software  JellyFish Technologies  SysArc Infomatix  MetricStream  Delhivery  Atidan  Experis  NICE  Dark Horse IT  VizExperts  CatalystOne  Syntel  BlackNGreen  InnoEye Technologies  Java R&D  QA InfoTech  HARMAN  Eli Global  Damco Solutions  LensKart  360 Degree  FlipKart  Egen Solutions  AppzCloud Technologies  TechAhead  Yamaha Motor Solutions  Quovantis Technologies  Adobe  Samsung Noida Lab  Lybrate  Novelvox  HSBC Holdings  Fluid AI  Nelito System  GoldenSource  Naaptol  Ashtech Infotech  Mobicule  Future Group  Calypso Technology  Skillnet Solutions  3i Infotech  Nucsoft  InteractCRM  Aurionpro Solutions  Hexaware Technologies  Ness Technologies  Cigniti Inc  ValueLabs  Magnaquest  Mphasis  IVY Comptech  Medlife.com  ServiceNow  Acclaris  Reliance Jio Infocomm  Bentley Systems  Erricson Worldwide  Hyland  Xpanxion  Cerner  Codeclouds IT Solutions  Procentris  Cleocotech International  Divergent Soft Lab  Endevor IT Solution  Impetus Infotech India  Bhaskar Technologies  SeroSoft Solutions  Retina Software  General Atomics  B3 - Brain Behind Brand  Oni Enterprises  Amal Infosystems  Future Focus Infotech  Celcom Technologies  Globez Professional Solutions  Harjai Computers  Pazzo Solutions  Data-Core Systems  Sampoorna Computer People  Trowano Avenues  ezyreach.in  Sandeep Dwellers  Interra Information Technologies  Sellcraft Global Solutions  RJS Tech Solutions  WSE Group  Magna India  Educiting Technologies  Continental Automotive Components India  IBM India  Asap Info Systems  Capgemini  Smart Move Career Consultants  Aeronube Technologies  Skywings Advisors  Diverse Lynx  ProCreations Kolkata  Tickto Solutions  Fresher Jobs  SMVA Consultants  Ixoraa Enterprises  ILabz Technology  2Coms Consulting  Talent Flix  Nat IT Solved   Kopal Consultants LLP  Rebaca Technologies  Techs To Suit Inc  Soffront Software  eDot Health Solutions  MSH Talent Solutions  Techathon Networks LLP  Vara United  Crossover for work  Wedoria Technologies  Golden Opportunities  Minivet System  Maitretech  JS Tech Alliance  BirjaSoft Technologies  BirlaSoft  AwzPact Technologies and Services  MaxGen Technologies  Manker Consultancy Services  I Quest Consultants  ACE Group  Seven Consultancy  WTM It Limited  P R Software  DezVen Software Solution  Aliens Group  EXL Tech Solutions  AcompWorld Technosoft  Eulogik  xtranet technologies  Java RnD      basic        frequent


 Q34. How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?Core Java2017-06-22 11:32:57

Ans. 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 or hacker over internet.

Once a String constant is created in Java , it stays in string constant pool until garbage collected and hence stays there much longer than what's needed. Any unauthorized access to string Pool pose a threat of exposing these values.


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

   Like      Discuss      Correct / Improve     Security  String pool   string immutable  immutability      expert        rare


Very frequently asked in HCL Tech ( Based of 4 inputs )
  Q35. Write a Program to reverse a string iteratively and recursivelyCore Java

Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character.

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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

   Like      Discuss      Correct / Improve     string  StringBuffer  recursion  for loop  control statements  loop statement  stringbuffer.append  java.lang.String  java.lang.StringBuffer  String Manipulation     HCL Technologies  Ocado  BlackRock  Oracle  FINRA  Arezzo Sky  Zalando  Boeing        frequent


Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q36. 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  Accenture India  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

Try 1 Question(s) Test


Very frequently asked across all types of companies.
  Q37. Difference between HashMap and Hashtable?Core Java
Anonymous
Ans. Hashtable is synchronized whereas HashMap is not.HashMap allows null values whereas Hashtable doesnt allow null values.

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

   Like      Discuss      Correct / Improve     java   collections   hashmap   map   hashtable   basic interview question   ebay   tcs    hcl technologies   infosys technologies     Morgan Stanley  Yahoo  Q3 Technologies  PriceLine  Solution Rally  Coupang  HCL Technologies  Tata Consultancy (TCS)   Infosys Technologies  Accenture  Accenture India  JPMorgan Chase  Priceline.com      basic        frequent

Try 2 Question(s) Test


Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)
  Q38. 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  Foot Locker  IMC Trading  LG Mobile Phones  Probity Soft  EPPS Infotech  AbeBooks  LiquidNet  Google  Girmiti Software  Hashcode IT Solutions  Aurionpro Solutions  Insonix  Genpact  Trentor  CatalystOne Solutions  RedBlink  Bayatree Infocom  Security Weaver  Steg Technologies  Roshi Software Solutions  DreamSoft4u  Decipher Zone Softwares  Precise Automation & Robotics  Componence  Dainik Navajyoti  Bodacious IT Hub  Naggaro      intermediate        frequent

Try 1 Question(s) Test


 Q39. Describe what happens when an object is created in Java ?Core Java
Anonymous
Ans. 1. Memory is allocated from heap to hold all instance variables and implementation-specific data of the object and its superclasses. Implemenation-specific data includes pointers to class and method data.
2. The instance variables of the objects are initialized to their default values.
3. The constructor for the most derived class is invoked. The first thing a constructor does is call the constructor for its superclasses. This process continues until the constructor for java.lang.Object is called,as java.lang.Object is the base class for all objects in java.
4. Before the body of the constructor is executed, all instance variable initializers and initialization blocks are executed. Then the body of the constructor is executed. Thus, the constructor for the base class completes first and constructor for the most derived class completes last.

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

   Like      Discuss      Correct / Improve     java   memory management   object creation   advanced   ebay



Do you think these are the Best Java Frameworks ?

OpenXavaSPRING MVCApache StripesCheck everything
that is Best in Java

Click Here



Frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q40. What are the methods of Object Class ?Core Java
Anonymous
Ans. clone() - Creates and returns a copy of this object.

equals() - Indicates whether some other object is "equal to" this one.

finalize() - Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

getClass() - Returns the runtime class of an object.

hashCode() - Returns a hash code value for the object.

toString() - Returns a string representation of the object.

notify(), notifyAll(), and wait() - Play a part in synchronizing the activities of independently running threads in a program.

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

   Like      Discuss      Correct / Improve     java   oops   object class     Capgemini  NIIT Technologies   Virtusa  Goldman Sachs  PwC  Citi  Expeditors  SoftFluent  LinkedIn  Amadeus  Navteq  PLC Systems  Axtria Associate  Netcracker Technology  Altisource      basic        frequent

Try 1 Question(s) Test


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: