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Interview Questions and Answers for 'Amd' - 25 question(s) found - Order By Newest

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

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

Sample code:

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

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

  Sample Code for equals

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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 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& 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

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  Q2. 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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Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q3. 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

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Frequently asked to fresh graduates and less experienced.
  Q4. Difference between Composition and Inheritance ?Core Java
Admin
info@buggybread.com
Ans. Inheritance means a object inheriting reusable properties of the base class. Compositions means that an abject holds other objects.

In Inheritance there is only one object in memory ( derived object ) whereas in Composition , parent object holds references of all composed objects.

From Design perspective - Inheritance is "is a" relationship among objects whereas Composition is "has a" relationship among objects.

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Very frequently asked in phone and walk in interviews.
  Q5. What are Marker Interfaces ? Name few Java marker interfaces ?Core Java
Anonymous
Ans. These are the interfaces which have no declared methods.Serializable and cloneable are marker interfaces.

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Very frequently asked.Usually among first few questions.
  Q6. What is MVC ? Design
Anonymous
Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application

1. Controller receives the requests and handles overall control of the request
2. Model holds majority of the Business logic, and
3. View comprise of the view objects and GUI component

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 Q7. How to find whether a given integer is odd or even without use of modulus operator in java?Core Java
Admin
info@buggybread.com
Ans. public static void main(String ar[])
{
int n=5;
if((n/2)*2==n)
{
System.out.println("Even Number ");
}
else
{
System.out.println("Odd Number ");
}
}

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  Q8. What is JSON ?Json
Anonymous
Ans. JSON is "JavaScript Object Notation", primarily used for client-server or server-server communication. Its a much lighter and readable alternative to XML. JSON is language independent and is easily parse-able in all programming languages.

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  Q9. What is reflection ?
Anonymous
Ans. It is the process of examining / modifying the behaviour of an object at runtime.

  Sample Code for reflection

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  Q10. 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.

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  Q11. Explain Application / Server architecture being used in your project ?

or

Explain your project architecture ?
Admin
info@buggybread.com
Ans. We are using cluster of Web servers and Application servers. Load Balancer is used to manage the load between them. Down the layer we have middleware server and then DB server to access database.

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  Q12. How are values passed in Java ? By value or reference ?Core Java

Ans. Java only provides pass by value.

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  Q13. How is multiple inheritance implemented in Java ?Core Java

Ans. There was no multiple inheritance in java before version 8 as implementing multiple interfaces cannot be termed as inheritance.

With Java 8 , came the concept of default methods wherein the class implementing the interface carries the default implementation from the interface and hence facilitating multiple inheritance.

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 Q14. What is the purpose of Commit and Rollback in Databases ?Database2016-07-14 14:28:55

Ans. When a DML is executed, the changes only stays in session and still not pushed to DB Tables, Commit is used to push those changes to the Tables.

In case we realize that we don't want to commit those changes and would like to ignore them, we can use rollback.

For example - You may like that for a banking transaction you would like to update the account balance only if the debit or credit record was correctly inserted, so you may like to encapsulate both DML's - insert for transaction and update for balance in a single transaction and would only commit if both succeeds else rollback.

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Very Frequently asked to Senior Software Engineers or Developers.
  Q15. Describe some of the Design Patterns you have used ?Design2016-12-01 16:31:17

Ans. [Open Ended Answer]

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Frequently asked in Accenture.
  Q16. What is your biggest achievement at work ?General2016-12-15 14:14:22

Ans. [Open Ended Answer]

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  Q17. Why java doesn't support multiple Inheritance ?

or

Explain Java Diamond Problem.
Core Java2017-01-09 11:45:34

Ans. class A {
void test() {
System.out.println("test() method");
}
}

class B {
void test() {
System.out.println("test() method");
}
}

Suppose if Java allows multiple inheritance like this,

class C extends A, B {
}

A and B test() methods are inheriting to C class.

So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity.

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  Q18. What is an exception and exception handling in Java ?Core Java2017-01-09 13:01:40

Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.


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Usually asked to entry level software developers.
  Q19. Write a program to swap two variables without using thirdCore Java2017-01-19 15:38:34

Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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 Q20. What are the methods to connect to database in Java ?Database2017-02-05 09:00:41

Ans. JDBC ( Java Database Connectivity ),ODBC (Open Database Connectivity), Hibernate, JPA ( Java Persistence API ), JOOQ,MyBatis

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   Like      Discuss      Correct / Improve     database connection  jdbc  ORM  Hibernate     Amdocs


 Q21. Write a SQL to delete duplicate records in a tableDatabase2017-04-20 06:42:22

Ans. DELETE FROM TABLE WHERE ROW_NUM NOT IN ( SELECT MAX(ROW_ID) FROM TABLE GROUP BY DUPLICATE_FIELD )

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   Like      Discuss      Correct / Improve          Amdocs  Accenture  Accenture India


  Q22. Difference between == and === ?JavaScript2018-07-04 16:16:18

Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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 Q23. Can you tell me any 10 unix command you have worked with ?Unix2018-11-27 09:14:38

Ans. grep, ls, kill, vi , scp , wget,telnet, zip, unzip,mv,cp

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 Q24. Write a Program to find depth of node binary tree ? Algorithm2019-01-16 10:11:37

 This question was recently asked at 'Amdocs'.This question is still unanswered. Can you please provide an answer.


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 Q25. Can you give me a use case where you utilized serialization in your project code?Core Java2019-06-02 08:30:40

 This question was recently asked at 'Amdocs'.This question is still unanswered. Can you please provide an answer.


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