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| Solution - Interview Questions and Answers for 'Emc' - 2 question(s) found - Order By Newest | ||||
 Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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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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 Discuss Correct / Improve  collections java data structures arraylist linkedlist arraylist vs linkedlist  Asked in 61 Companies  Basic  frequent | ||||
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 If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ? | ||||
| Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? | ||||
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| 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>(); | ||||
| What is the difference between List, Set and Map ? or 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 ? | ||||
| Advanced level question frequently asked in US based companies. Recently asked in EMC and Intuit. | ||||
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| Ans. Simplest implementation we can have is a List wherein we can place ordered words and hence can perform Binary Search. Other implementation with better search performance is to use HashMap with key as first character of the word and value as a LinkedList. Further level up, we can have linked Hashmaps like , hashmap { a ( key ) -> hashmap (key-aa , value (hashmap(key-aaa,value) b ( key ) -> hashmap (key-ba , value (hashmap(key-baa,value) .................................................................................... z( key ) -> hashmap (key-za , value (hashmap(key-zaa,value) } upto n levels ( where n is the average size of the word in dictionary. | ||||
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| Discuss Correct / Improve java collections hashmap binary search search algorithm advanced architecture data structure Asked in 6 Companies frequent | ||||
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