What is the difference between treeset and hashset

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In short, although all three are Set interface implementation they offer distinctive feature, HashSet is a general purpose Set while LinkedHashSet provides insertion order guarantee and TreeSet is a SortedSet which stores elements in sorted order specifi ed by Comparator or Comparable in Java. How to copy object from one Set to other. You will get exact replica of source Set, in terms of contents and order. Here static method copy Set source is writt en using Generics , This kind of parameterized method pr ovides type-safety and help to avoid ClassCastException at runtime.

Always code for interface than implementation so that you can replace HashSet to LinkedHashSet or TreeSet when your requirement changes. If you know any other significant difference between TreeSet , LinkedHashSet, and HashSet which is worth remembering then please add as a comment.

Other tutorials from Java Collection Framework. How to sort ArrayList in descending order in Java. How to convert List to Array in Java. How to create read-only or unmodifiable Collection in Java.

How to convert Collection to coma separated String in Java. Share to Twitter Share to Facebook. Labels: collections interview questions , core java , core java interview question , java collection tutorial , programming. How the linkedhashset maintens order internally?

Doesn't it breach the hashing principle? December 11, at AM Anonymous said March 10, at AM Sekar said January 30, at AM Anonymous said It gives null pointer exception. March 1, at AM Anonymous said May 13, at PM Unknown said September 8, at AM gillbc said October 16, at AM Unknown said Implementation through doubly linked list November 28, at AM Pratyush said Tks June 14, at PM Anonymous said November 4, at PM javin paul said November 6, at AM.

Newer Post Older Post Home. Subscribe to: Post Comments Atom. Subscribe for Discounts and Updates Follow. Clone method copy technique: Both HashSet and TreeSet uses shallow copy technique to create a clone of their objects. Fail-fast Iterators : The iterators returned by this class's method are fail-fast: if the set is modified at any time after the iterator is created, in any way except through the iterator's own remove method, the iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.

When to prefer TreeSet over HashSet 1. Sorted unique elements are required instead of unique elements. The sorted list given by TreeSet is always in ascending order. TreeSet has greater locality than HashSet. If two entries are near by in the order , then TreeSet places them near each other in data structure and hence in memory, while HashSet spreads the entries all over memory regardless of the keys they are associated to. Implementation: Here we will be discussing them both with 2 examples for both of them.

Let us start with HashSet later on dwelling on to TreeSet. Skip to content. Change Language. Related Articles. Table of Contents. Save Article. Improve Article. Like Article. Output: HashSet contains: practice geeks for contribute. Output: TreeSet contains: contribute for geeks practice. Previous Median of two sorted arrays of different sizes Set 1 Linear.