Hashmap entrySet complexity

What is the complexity of iterating the elements, having them by calling entrySet in the hashmap.

Is it the same as if the elements were in a list?
romramAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ksivananthCommented:
traversing all same...

values() will return a list with values in the map.
entrySet() will return a set with Entry( key, value ) in the map!
0
romramAuthor Commented:
So, I mean in  this case using hashmap or list is the same in this case, both will give us O(n) complexity, right?
0
NovaDenizenCommented:
I looked at java/util/HashMap.java (dated 2006), and it looks like the Set iterator you get from entrySet() uses just a very thin wrapper around the HashMap.  The HashMap uses an array of linked lists for its data structure.  Iterating through the HashMap takes O(k+n) time, where k is the capacity of the hashmap and n is the count of elements stored in it.  

If you assume the hash table is sized appropriately for the number of objects stored in it (like within a factor of 2 or so), then iterating through it is O(n).
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Programming Theory

From novice to tech pro — start learning today.