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HCL Technologies

HCL Technologies Limited is an Indian multinational IT services company, headquartered in Noida, Uttar Pradesh, India. It is a subsidiary of HCL Enterprise.

Link: https://www.hcltech.com/
   




Data structure - Interview Questions and Answers for 'Hcl technologies' - 2 question(s) found - Order By Newest

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q1. What is the difference between ArrayList and LinkedList ?Core Java
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Ans. Underlying data structure for ArrayList is Array whereas LinkedList is the linked list and hence have following differences -

1. ArrayList needs continuous memory locations and hence need to be moved to a bigger space if new elements are to be added to a filled array which is not required for LinkedList.

2. Removal and Insertion at specific place in ArrayList requires moving all elements and hence leads to O(n) insertions and removal whereas its constant O(1) for LinkedList.

3. Random access using index in ArrayList is faster than LinkedList which requires traversing the complete list through references.

4. Though Linear Search takes Similar Time for both, Binary Search using LinkedList requires creating new Model called Binary Search Tree which is slower but offers constant time insertion and deletion.

5. For a set of integers you want to sort using quicksort, it's probably faster to use an array; for a set of large structures you want to sort using selection sort, a linked list will be faster.

  Sample Code for ArrayList

  Sample Code for LinkedList

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 Q2. Implement a Stack with 2 threads in which one thread push data and another pop data.Data Structure2018-11-27 09:14:19

 This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer.


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