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Interview Questions and Answers for 'Efi' - 12 question(s) found - Order By Newest

Very Very frequently asked. Among the first few questions in almost all interviews.Among Top 5 frequently asked questions.
  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

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   Like      Discuss      Correct / Improve     java   string comparison   string   object class   ==    equals   object equality     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      basic        frequent

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 Q2. What things should be kept in mind while creating your own exceptions in Java?Core Java
Admin
info@buggybread.com
Ans. All exceptions must be a child of Throwable.

If you want to write a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Exception class.

You want to write a runtime exception, you need to extend the RuntimeException class.

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   Like      Discuss      Correct / Improve     java   exceptions   exception handling   user defined exceptions   throwable   architecture   library development   technical architect   technical lead


Frequently asked question in companies using hibernate.
  Q3. 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.

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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   architecture   technical lead     EFI  Geometric  QuinStreet  Cognizant (CTS)  ZS Associates  Walt Disney      Intermediate        frequent


 Q4. What is DTD ?Xml
Admin
info@buggybread.com
Ans. DTD or Document Type Definition is a standard agreed upon way of communication between two parties. Your application can use a standard DTD to verify that data that you receive
from the outside world is valid and can be parsed by your parser.

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   Like      Discuss      Correct / Improve     xml   markup language   dtd   document type definition   architecture


 Q5. What are few of the Annotations pre defined by Java?
Anonymous
Ans. @Deprecated annotation indicates that the marked element is deprecated and should no longer be used. The compiler generates a warning whenever a program uses a method, class, or field with the @Deprecated annotation.

@Override annotation informs the compiler that the element is meant to override an element declared in a superclass.

@SuppressWarnings annotation tells the compiler to suppress specific warnings that it would otherwise generate.

@SafeVarargs annotation, when applied to a method or constructor, asserts that the code does not perform potentially unsafe operations on its varargsparameter. When this annotation type is used, unchecked warnings relating to varargs usage are suppressed.

@FunctionalInterface annotation, introduced in Java SE 8, indicates that the type declaration is intended to be a functional interface, as defined by the Java Language Specification.

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   Like      Discuss      Correct / Improve     java   java8   annotations   pre defined annotations


Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan (Based on 2 feedback)
  Q6. Explain Singleton Design Pattern ?Design
Admin
info@buggybread.com
Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html

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   Like      Discuss      Correct / Improve     java   design pattern   singleton   at&t   ebay  fidelity india  united healthcare india     JP Morgan  Tata Consultancy (TCS)  HCL Technologies  Wipro  Infosys  Tibco  Edline  JPMorgan Chase  Sabre  Bank Of America India  Fidelity  Samsung India  Robert Bosch India  ZapCom  Goldman Sachs India  Eze Software  ZapCom  Dailymotion  Netflix  CenturyLink  Misfit  TSYS  ECI Telecom  Dealogic  Robert Bosch  Redolent  EFI  CSX  Prolific  Validus  Birlasoft  AdNovum  NCR  Ray Business Technologies  Nagravision  Unify  SLK Group  DBS Bank   Razorthink  GST Global      intermediate        frequent


 Q7. Difference between prefix and postfix increment operator ?
Admin
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Ans. Prefix operator performs the increment and then assignment whereas its inverse for postfix operator.

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   Like      Discuss      Correct / Improve     prefix increment operator   postfix increment operator   operators   java      basic        frequent


Frequently asked in high end product companies.
 Q8. Write code for LRU CacheCore Java2017-01-10 10:15:17

 This question was recently asked at 'United Health Group (UHG),Google,Zenefits,Amazon,Microsoft,SurveyMonkey,LinkedIn,Sanpdeal,MarkMonitor'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     cache  LRU cache  coding  code     United Health Group (UHG)  Google  Zenefits  Amazon  Microsoft  SurveyMonkey  LinkedIn  Sanpdeal  MarkMonitor      intermediate


 Q9. What are the benefits of using Prepared statements ?Database2017-03-09 11:32:07

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     ADP

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 Q10. 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 ?Database2017-03-09 11:33:25

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     ADP

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 Q11. What are the benefits of using Wrapper classes over primitive types ?Core Java2017-08-24 21:35:53

Ans. With Collection classes , we cannot use primitive types. Moreover for any class using generic types, we cannot use primitive types.

They add more functionality by means of additional methods.

As their reference can be null , they offer consistent check for uninitialized state.

They facilitate caching and reuse by means of constant Pools.

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   Like      Discuss      Correct / Improve     wrapper classes  benefits of wrapper classes over primitives


 Q12. What are the benefits of immutability or Immutable classes ?Core Java2017-08-28 19:36:18

 This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     immutable classes   benefits of immutable classes




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