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Design - Interview Questions and Answers for 'Cognizant (cts)' - 7 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q1. Differences between abstract class and interface ?Core Java
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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   Like         Discuss         Correct / Improve     java   classes   abstract class   interfaces     Asked in 65 Companies      basic        frequent


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. What is the use of Transient Keyword ?Core Java
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Ans. It in Java is used to indicate that a field should not be serialized.

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   Like         Discuss         Correct / Improve     java   oops   serialization   transient   java keywords     Asked in 38 Companies      intermediate        frequent

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Very Frequently asked to Senior Software Engineers or Developers.
  Q4. 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


 Q5. How you can check Object is created or not in case of Singleton using Object class method ?Design2018-10-27 07:41:37

Ans. Reflections-- setAccesible--avoid using enumns

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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q6. How to avoid cloning, serialization in the singleton class ?Design2019-01-04 10:12:26

Ans. For Cloning-exception,For deserialization-read.resolve()

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   Like         Discuss         Correct / Improve     singleton  cloneable  serializable  serialization  cloning     Asked in 1 Companies


 Q7. When singleton can break and how to resolve itDesign2019-05-03 07:57:33

 This question was recently asked at 'Cognizant (CTS)'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     singleton  design patterns     Asked in 1 Companies




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