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|Interview Questions and Answers|
|Ans. Initialize an ArrayList that will hold LinkedLists i.e every element of the arraylist will be a linked list.|
Such collection could be used in algorithms that require first random access and then sequential traversal. For example - Storing traversal paths for a graph wherein we can start from any vertex. Implementing dictionary with each arraylist element holding staring with character and then linked list holding duplicate words.
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|Like Discuss Correct / Improve  collections  linkedlist  arraylist|
|What is the difference between ArrayList and LinkedList ?|
|If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?|
|Difference between HashMap and Hashtable?|
|Difference between TreeMap and HashMap ?|
|Can you provide some implementation of a Dictionary having large number of words ?|
|Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?|
|What is a ConcurrentHashMap ?|
| Collections.sort can only be performed on ..|
d. Any Collection implementation
|How is Hashmap internally implemented in Java ?|
| What is the difference between List, Set and Map ?|
What are the different Java Collections Interfaces ?