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Interview Questions and Answers for 'Trimax IT Infrastructure' - 10 question(s) found - Order By Newest

  Q1. 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

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   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   travelex      basic        frequent


  Q2. 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.

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Basic and Very Frequently asked.
  Q3. 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

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Usually asked in relation to casting and ClassCastException.
 Q4. What is instanceOf operator ? Explain it's use ?Core Java2017-06-12 07:58:22

Ans. The operator instanceOf is used to verify if the specified object is the instance of specified class or interface.

Syntax if(x instanceOf ABC)

where x is an object reference and ABC could be a class name or interface name. The above statement will be true if x holds an object that is an instance of ABC or any of the child class of ABC or if x holds an object that implements ABC.

instanceOf operator is used to verify in case of downcasting. For ex -

DerivedClass extends BaseClass

x is the reference of BaseClass but holds DerivedClass object ( Polymorphism )

There is an operation that is defined in Derived Class, let's say derivedClassMethod()

We cannot call derivedClassMethod() directly using x as x is reference of BaseClass and not DerivedClass and hence can only access methods that are defined in BaseClass and overridden in derived class.

Though we can cast it to DerivedClass as following
((DerivedClass)x).derivedClassMethod();

But it may throw ClassCastException in case x doesn't hold an instance of DerivedClass at that point.

So before casting it to DerivedClass we may like to make sure that it is an instance of DerivedClass and hence won't throw ClassCastException.

So we make a check for it

if(x instanceOf DerivedClass) {
((DerivedClass)x).derivedClassMethod();
}

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 Q5. How can we manage Error Messages in the web application ?Solution
Anonymous
Ans. Within message.properties file.

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  Q6. Write a method to check if input String is Palindrome?Core Java
Admin
info@buggybread.com
Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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Frequently asked in CTS ( Based on 2 feedback )
  Q7. What is the difference between comparable and comparator in java.util pkg?Core Java
Admin
info@buggybread.com
Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

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 Q8. What is JVM ?Core Java2017-04-07 10:16:18

Ans. JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent).Runtime Instance Whenever you write java command on the command prompt to run the java class, an instance of JVM is createdThe JVM performs following operation:Loads codeVerifies codeExecutes codeProvides runtime environment

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 Q9. What is the use of final keyword ?Core Java2017-06-08 06:17:54

Ans. final keyword is a modifier that means differently when applied to variables, methods and classes.

1. Final variable cannot be changed once initialized
2. Final method cannot be overridden
3. Final class cannot be sub classed

  Sample Code for final variable

  Sample Code for final method

  Sample Code for final class

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Very frequently asked. Usually among very first few questions.
 Q10. Define encapsulation in Java ?Core Java2017-06-12 07:55:47

Ans. Encapsulation is a feature of OOP's that binds the data and it's associated methods together as a single unit and facilitate protection and data hiding by providing minimal interface to outside. For example - member variables are declared private and are accessed through public methods. Moreover we have private methods that can only be used internally and hence providing minimal interface to outside class through use of public methods.

  Sample Code for encapsulation

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