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Interview Questions and Answers for 'NCR' - 9 question(s) found - Order By Newest

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture.
  Q1. What is the difference between final, finally and finalize() ?Core Java
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Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing.

finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc.

finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state.

  Sample Code for final

  Sample Code for finally

  Sample Code for finalize

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   Like         Discuss         Correct / Improve     java   oops   final   finally   finalize     Asked in 60 Companies      basic        frequent

Try 4 Question(s) Test


Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q2. What is Dependency Injection or IOC ( Inversion of Control ) ?Design

Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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   Like         Discuss         Correct / Improve     design patterns   ioc ( Inversion of Control )  dependency injection     Asked in 80 Companies      intermediate        frequent


 Q3. Difference between Base Class, Derived Class , Abstract Class and Concrete Class ?Core Java2019-01-20 10:09:38

Ans. Base Class is a relative term used to signify the Parent class in Parent - Child or Base - derived relationship.

Derived Class is a relative term used to signify the Child class in Parent - Child or Base - derived relationship.

Abstract Class is a class that is not allowed to be instantiated and hence can serve only a base class for it's usage.

Concrete Class is the class which is supposed to be instantiated and hence provide definition for all implementing interface methods and extending abstract methods.

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   Like         Discuss         Correct / Improve     Base Class   Derived Class    Abstract Class   Concrete Class


Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.
  Q4. What is rule regarding overriding equals and hashCode method ?Core Java
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Ans. A Class must override the hashCode method if its overriding the equals method.

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   Like         Discuss         Correct / Improve     java   collections   hashcode  hash code   equals   collections     Asked in 44 Companies      intermediate        frequent

Try 1 Question(s) Test


Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)
  Q5. Explain Singleton Design Pattern ?Design
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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     Asked in 46 Companies      intermediate        frequent


 Q6. Difference between prefix and postfix increment operator ?
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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


Usually asked with Questions related to Generics.
 Q7. What are Type Erasures in Java ?Core Java2016-11-15 09:59:21

Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts.

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   Like         Discuss         Correct / Improve     type erasures  generics     Asked in 2 Companies      intermediate        rare


  Q8. Find Intersection/union between two arrays.Core Java2018-05-13 19:40:34

 This question was recently asked at 'Bristlecone,Amazon Lab126,Amazon,Microsoft,Facebook,NCR,Google'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     arrays  code  coding     Asked in 7 Companies        frequent


 Q9. Can you share your experience with encoding and encryption ?Encoding2019-08-09 09:43:19

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


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   Like         Discuss         Correct / Improve     encoding  encryption




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