What is the difference between linkedhashset and treeset

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HashSet ; import java. LinkedHashSet ; import java. Set ; import java. Download Run Code. Another notable difference between them comes in terms of speed. Both the HashSet and LinkedHashSet class offers O 1 time performance for the basic operations such as add, remove, contains and size, etc. This assumes that the hash method uniformly distributes elements in the bucket. TreeSet is slowest among all which guarantees O log n time cost for these operations since it is implemented using a red-black tree.

All these 3 implement the Set interface. HashSet is backed by a hash table actually a HashMap instance. LinkedHashSet uses Hash table and linked list. Collectives on Stack Overflow. Learn more. Asked 7 years, 11 months ago. Active 1 year, 8 months ago. Viewed 27k times. And one sub question is, Which one has same or average time complexity for all its operations Your response will be greatly appreciated. Leomord 11 11 bronze badges.

Prashant Shilimkar Prashant Shilimkar 7, 12 12 gold badges 47 47 silver badges 84 84 bronze badges. Add a comment. Active Oldest Votes. Anyway before seeing difference between TreeSet, LinkedHashSet and HashSet, let's see some similarities between them: 1 Duplicates : All three implements Set interface means they are not allowed to store duplicates.

Since TreeSet uses compareTo method of respective elements to compare them which throws NullPointerException while comparing with null, here is an example: TreeSet cities Exception in thread "main" java. NullPointerException at java. All three implements Set interface means they are not allowed to store duplicates. You mean they just ignore duplicate value or replace. I mean internal code is written for replace or ignore.

This is m asking because in interview i asked this. Updated the answer also have a look into sourcecode I have attached — constantlearner. Does Set permites duplicates and if so When?? Does LinkedHashSet use equals?