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Design - Interview Questions and Answers for 'Tcs' - 13 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
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   abstract class vs interface   abstract classes vs interfaces     Asked in 82 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 83 Companies      intermediate        frequent

Very frequently asked.Usually among first few questions.
  Q3. What is MVC ? Design
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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   Like         Discuss         Correct / Improve     j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay     Asked in 60 Companies      basic        frequent
Try 1 Question(s) Test

  Q4. What is the use of Transient Keyword ?Core Java
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 39 Companies      intermediate        frequent
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 Q5. If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?Design
Ans. Each has it's own advantages

Batching requires less resources but may result in loosing whole batch in case of failure whereas concurrency even though is little more expensive in terms of resources but would result in minimal loss in case of failure.

In case messages are to be consumed in a particular order, batching them in that order and then consuming them makes better sense.

if incoming messages are not continuous , it makes more sense to do concurrency as we need not wait for all messages to form a batch and flush. Though time sensitivity can be added but that would add unnecessary complexity.

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   Like         Discuss         Correct / Improve     concurrency vs batching   concurrency  multithreading  batch

Very Frequently asked to Senior Software Engineers or Developers.
  Q6. Describe some of the Design Patterns you have used ?Design
Ans. [Open Ended Answer]

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

 Q7. What is abstraction ?Design
Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user.

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   Like         Discuss         Correct / Improve     bstraction  oops concepts  oops principle     Asked in 22 Companies

Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)
  Q8. Explain Singleton Design Pattern ?Design
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

Frequently asked in face to face interviews.
  Q9. Write a program to print fibonacci series.Core Java
Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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   Like         Discuss         Correct / Improve     ebay   fibonacci series     Asked in 66 Companies      basic        frequent

Frequently asked Design Pattern interview question.
 Q10. What is a prototype design pattern ?Design
Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects.

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   Like         Discuss         Correct / Improve     design pattern  prototype design pattern  cloning     Asked in 11 Companies      intermediate

 Q11. Design a Passport Office systemDesign
 This question was recently asked at 'Netcracker Technology'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Design     Asked in 1 Companies

 Q12. Draw uml for singleton pattern.Design
 This question was recently asked at 'deutche bank'.This question is still unanswered. Can you please provide an answer.


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

 Q13. If you have to pull a sub string out of a string, which method would you use - using String methods or Pattern / Matcher ?Design
Ans. It depends on how complex it is and if in future it would need any sort opf debugging. It's not easy to debug code if it's making heavy use of shortcuts like Lambda , Patterns etc.

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   Like         Discuss         Correct / Improve     pattern matching  String  design

 Q14. Which of the following is not the benefit of Lazy Initialization in Hibernate ?Hibernate
a. Laod When required provides better performance
b. Object stays lighter
c. Less number of Database calls
d. Less load on Database

Ans.c. Less number of Database calls

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