Updating a hashmap

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Tree Map provides guaranteed log(n) time cost for the get, put, contains Key and remove operations.

Algorithms are adaptations of those in Cormen, Leiserson, and Rivest's Introduction to Algorithms.

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but Hash Map is certainly faster than Hashtable because it's not synchronized.BTW, constant time performance is only provided if mappings are distributed uniformly across bucket location.In the real world, you always have collision and Hash Map handles collision by using a linked list to store collided elements.Tree Map is so it's costlier than Hash Map if the order is not concerned.Since and uses linked list to provide insertion order guarantee.

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