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Interview Questions and Answers for 'Amdoc' - 33 question(s) found - Order By Rating

 Q1. How to sort an ArrayList of objectsData Structure2019-10-29 15:21:43

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


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q2. Write an algorithm to shift a linked list n positions.Data Structure2019-09-17 13:10:15

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


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q3. Given 3 arrays - A, B and C, Write all elements from C that are a sum of 1 element from A and 1 from B.

For example -

A -[1,2,4,6]
B-[3,9]
C-[2,4,5,6,7,9,10,12,15]

Output - 4,5,7,9,15
2019-09-17 13:09:50

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


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 Q4. Write a program to rotate a matrix.2019-09-17 13:05:47

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


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 Q5. What is the difference between map and filter methods in streams ?Core Java2019-09-11 08:08:12

Ans. By using map , you can transform the object values. The map operation allows us to apply a function, that takes input parameter of one type, and returns something else.

Filter is used for filtering the data, it always returns the boolean value. If it returns true, then item is added to list else its filtered out (ignored)

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   Like         Discuss         Correct / Improve     java 8     Asked in 1 Companies


 Q6. Explain how a class is loaded ?Core Java2019-08-07 13:14:44

Ans. Java classLoder is resposible to load java classes.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q7. How do you analyze memory leaks in your java application ?2019-07-15 08:28:16

Ans. https://dzone.com/articles/what-to-do-about-java-memory-leaks-tools-fixes-and

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q8. Can you give me a use case where you utilized serialization in your project code?Core Java2019-06-02 08:30:40

Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization

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   Like         Discuss         Correct / Improve     serialization     Asked in 1 Companies


 Q9. Write a Program to find depth of node binary tree ? Algorithm2019-01-16 10:11:37

Ans. public static int getLevel(Node root, int key) {
int levelOfNode = getLevelUtil(root, key, 1);
return levelOfNode;
}

public static int getLevelUtil(Node root, int key, int level) {
if (root == null) return 0;
if (root.data == key) return level;
int left = getLevelUtil(root.left, key, level 1);
int right = getLevelUtil(root.right, key, level 1);
if (left != 0) return left;
else return right;
}

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 Q10. Pascal Triangle Program2019-01-08 15:54:25

 This question was recently asked at 'Xalted Information Systems,Amdocs,Booking.com,Facebook,Yelp,Concerto Software,Dassault Systemes,ING Group'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 8 Companies


 Q11. 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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   Like         Discuss         Correct / Improve     unix commands     Asked in 1 Companies      basic


  Q12. 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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   Like         Discuss         Correct / Improve     ==  ===  == vs ===     Asked in 13 Companies      basic        frequent


 Q13. what is fail fast and Fail Safe in collections?Core Java2017-12-26 10:01:44

Ans. Iterators in java are used to iterate over the Collection objects.

Fail-Fast iterators immediately throw ConcurrentModificationException if there is any addition, removal or updation of any element.

Fail-Safe iterators don't throw any exception if a collection is structurally modified while iterating over it. This is because, they operate on the clone of the collection and not on the original collection.

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   Like         Discuss         Correct / Improve     ail fast   fail saf     Asked in 8 Companies      intermediate


  Q14. 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 protection
4. Polymorphism for flexibility and interfacing

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   Like         Discuss         Correct / Improve     oops  oops features     Asked in 237 Companies      basic        frequent


 Q15. 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          Asked in 3 Companies


 Q16. 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     Asked in 1 Companies


  Q17. 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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   Like         Discuss         Correct / Improve     exception handling     Asked in 18 Companies      basic        frequent


  Q18. 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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   Like         Discuss         Correct / Improve     multiple inheritance  object oriented programming (oops)  oops concepts  diamond problem     Asked in 20 Companies      basic        frequent


Frequently asked in Accenture.
  Q19. What is your biggest achievement at work ?General2016-12-15 14:14:22

Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     general question  non technical question     Asked in 20 Companies        frequent


Very Frequently asked to Senior Software Engineers or Developers.
  Q20. Describe some of the Design Patterns you have used ?Design2016-12-01 16:31:17

Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     design patterns     Asked in 17 Companies      intermediate        frequent


 Q21. 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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   Like         Discuss         Correct / Improve     databases  commit  rollback     Asked in 2 Companies      Basic


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 )
  Q22. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

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

Sample code:

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

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

  Sample Code for equals

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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     Asked in 289 Companies      basic        frequent

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  Q23. 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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   Like         Discuss         Correct / Improve     json   markup language   client server communication     Asked in 26 Companies      basic        frequent

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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.
  Q24. 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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   Like         Discuss         Correct / Improve     java   oops   overloading   overriding   oops concepts   basic interview question     Asked in 82 Companies      basic        frequent

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Very frequently asked in phone and walk in interviews.
  Q25. 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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   Like         Discuss         Correct / Improve     java   oops   interfaces   marker interface   serializable   clonable     Asked in 21 Companies      intermediate        frequent

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  Q26. 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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   Like         Discuss         Correct / Improve     java   reflection   reflection api   ebay   mindtree     Asked in 29 Companies      basic        frequent


Very frequently asked.Usually among first few questions.
  Q27. 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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  Q28. 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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   Like         Discuss         Correct / Improve     java   string   hashcode   hash code   string comparison  hashtable     Asked in 17 Companies      basic        frequent


Frequently asked to fresh graduates and less experienced.
  Q29. 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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   Like         Discuss         Correct / Improve     java   oops   oops concepts   inheritance  object oriented programming (oops)  oops concepts   composition  object oriented programming (oops)  oops concepts   difference between   basic interview question     Asked in 12 Companies      basic        frequent

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 Q30. 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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   Like         Discuss         Correct / Improve     java   code   coding   tricky questions   interesting questions   modulus operator     Asked in 4 Companies        frequent


  Q31. 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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   Like         Discuss         Correct / Improve     architecture   production support   java   servers   application support     Asked in 7 Companies        frequent


  Q32. How are values passed in Java ? By value or reference ?Core Java

Ans. Java only provides pass by value.

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  Q33. 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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