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Interview Questions and Answers for 'Accuity' - 2 question(s) found - Order By Newest

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q1. Difference between TreeMap and HashMap ?Core Java
Anonymous
Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly.

  Sample Code for treemap

  Sample Code for hashmap

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Related Questions

  Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap
  What is comparator interface used for ?
  Which of the following collection maintain its elements in Natural Sorted order ?
  Which are the sorted collections ?
  How can we reverse the order in the TreeMap ?
  TreeMap orders the elements on which field ?
  How TreeMap orders the elements if the Key is a String ?
  Can we add heterogeneous elements into TreeMap ?
  Will it create any problem if We add elements with key as user defined object into the TreeMap ?


Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q2. What is the difference between ArrayList and LinkedList ?Core Java
admin
info@buggybread.com
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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Related Questions

 If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?
  Difference between Vector and ArrayList ?
  Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?
  Difference between ArrayList and LinkedList ?
  Is this Polymorphism ?

Map<String, List<String>> inventoryManagerCountMap = new HashMap<String, ArrayList<String>>();
  What is CopyOnWriteArrayList ?
  What are the advantages and disadvantages of CopyOnWriteArrayList ?
 Can we add more elements to an array list that has been marked as final ?
 Does an ArrayList allow elements of different types ? If not, Why the following code works List list1 = new ArrayList<>(); list1.add(1); list1.add("1");




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