Data structure - Interview Questions and Answers for 'Deloitte' | Search Java Interview Question -

Search Interview Questions

 More than 3000 questions in repository.
 There are more than 900 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text




Data structure - Interview Questions and Answers for 'Deloitte' - 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
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

 Help us improve. Please let us know the company, where you were asked this question :   

   Like         Discuss         Correct / Improve     collections   java   data structures   arraylist   linkedlist     Asked in 61 Companies      Basic        frequent

Try 1 Question(s) Test

Related Questions

 If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?
 Collections.sort can only be performed on ..

a. Set
b. List
c. Map
d. Any Collection implementation
 Is this a valid initialization ? Explain.

Collection<Collection> collection = new LinkedList<LinkedList>();
 In a Linked list with sorted numbers, insert a new numbers while maintaining the sort order.
  What is the difference between List, Set and Map ?


What are the different Java Collections Interfaces ?
  Difference between Vector and ArrayList ?
  Overridden methods must have the same ...
  Which of the following doesn't extend Collection interface ?
  Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

 Q2. Create a stack of specific size using arrayList?Data Structure2018-04-04 21:33:45

Ans. public class StackUsingArrayList {
   public static void main(String[] args) {
      List list = new ArrayList();
      Stack stack = new Stack();

      list.forEach(a -> stack.add(a));

 Help us improve. Please let us know the company, where you were asked this question :   

   Like         Discuss         Correct / Improve          Asked in 1 Companies

Related Questions

  Difference between == and .equals() ?
  Why is String immutable in Java ?
  Explain the scenerios to choose between String , StringBuilder and StringBuffer ?


What is the difference between String , StringBuilder and StringBuffer ?
  What are the difference between composition and inheritance in Java?
  Does garbage collection guarantee that a program will not run out of memory?
  What are different ways to create String Object? Explain.
  Why Char array is preferred over String for storing password?
  Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?
 What is the difference between declaration, instantiation and initialization ?
 Explain OOPs


Explain OOPs Principles


Explain OOPs Concepts


Explain OOPs features


Tell me something about OOPs

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked: