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Interview Questions and Answers for 'Adp' - 16 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 ) and Epam Systems
  Q1. Difference between == and .equals() ?Core Java
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   == vs equals   equals vs ==     Asked in 294 Companies      basic        frequent
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Frequently asked.
 Q2. If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?Core Java
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

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   Like         Discuss         Correct / Improve     java   collections   list   arraylist   linkedlist   difference between   architecture   data structure   ebay     Asked in 2 Companies      basic        frequent
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 Q3. What are the design considerations while making a choice between using interface and abstract class ?Core Java
Ans. Keep it as a Abstract Class if its a "Is a" Relationsship and should do subset/all of the functionality. Keep it as Interface if its a "Should Do" relationship.

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   Like         Discuss         Correct / Improve     java   oops   abstract classes   interfaces   advanced     Asked in 3 Companies

 Q4. What are some different logging levels for log4j ?Log4j
Ans. DEBUG
ERROR
ALL
WARN
INFO
FATAL
OFF
TRACE
TRACE_INT
WARN

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   Like         Discuss         Correct / Improve     java   log4j   log4j level   logging   error logging     Asked in 10 Companies

 Q5. What is a cloneable interface and what all methods does it contain?Core Java
Ans. Cloneable is a declaration that the class implementing it allows cloning or bitwise copy of it's object state. It is not having any method because it is a MARKER interface.

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   Like         Discuss         Correct / Improve     java   oops   cloneable   marker interface  cloning     Asked in 2 Companies

 Q6. What are the benefits of using Prepared statements ?Database
Ans. 1. Precompilation , DB-side caching and reuse of same execution plan leads to overall faster execution.

2. Automatic prevention of SQL injection attacks by escaping special characters

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   Like         Discuss         Correct / Improve     Prepared statements  benefits of prepared statements     Asked in 1 Companies
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 Q7. What are the benefits of using prepared statements ? Does that benefit extend only if similar prepared statements are used within a application or it extends even with multiple applications having similar prepared statement ?Database
Ans. Prepared Statements helps in reuse of database execution plan which can be cached at Database level and hence helps achieving faster execution and performance. As cached ps objects are creating at Database level and not application level, the use and benefit extends across multiple applications.

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   Like         Discuss         Correct / Improve     Prepared statements  benefits of prepared statements     Asked in 1 Companies
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 Q8. Where the prepared Statement object creating - In Java application or DB ?Database
Ans. Prepared Statement objects are created and cached at database level.

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   Like         Discuss         Correct / Improve     Prepared statements     Asked in 1 Companies
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 Q9. What are the types of Executor Interfaces ?Core Java
Ans. Executor - Simple Interface that supports launching new tasks.

ExecutorService - Subinterface of Executor, which adds features that help manage the lifecycle, both of the individual tasks and of the Executor itself.

ScheduledExecutorService - Subinterface of ExecutorService, supports future and-or periodic execution of tasks.

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   Like         Discuss         Correct / Improve     Executor Interfaces     Asked in 1 Companies

 Q10. What are the core interfaces in Hibernate?Hibernate
Ans. Session,SessionFactory,Configuration,Transaction,query and Criteria

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   Like         Discuss         Correct / Improve     core interfaces of Hibernate     Asked in 1 Companies        frequent
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 Q11. If two Interfaces have same Method, how to handle that Method in a Class implementing these two Interfaces?Core Java
Ans. It doesn't matter how you define that method in implementing class. there will be only one definition provided and that method can be accessed using reference of either of the interfaces.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q12. Which type of EJB can use bean pooling?Java EE
Ans. Stateless Session Beans

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   Like         Discuss         Correct / Improve     EJB  java beans     Asked in 1 Companies

 Q13. Difference between Include Directive and include action in jspJava EE
Ans. Include directive includes the file at translation time (the phase of JSP life cycle where the JSP gets converted into the equivalent servlet) whereas the include action includes the file at runtime.

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   Like         Discuss         Correct / Improve     JSP  include directive  include action     Asked in 1 Companies

 Q14. Difference between import and include directive in jspJava EE
 This question was recently asked at 'ADP'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     JSP  import and include directive in jsp     Asked in 1 Companies

  Q15. Difference between == and === ?JavaScript
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

 Q16. Where will you configure database details in tomcat server ?Tomcat
Ans. Add a file META-INF/context.xml into the root of your web application folder, which defines database connection detail :

File : META-INF/context.xml

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

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