Web Reference: Mar 26, 2026 · HashSet in Java implements the Set interface of the Collections Framework. It is used to store the unique elements, and it doesn't maintain any specific order of elements. Apr 16, 2016 · A Set represents a generic "set of values". A TreeSet is a set where the elements are sorted (and thus ordered), a HashSet is a set where the elements are not sorted or ordered. Since HashSet implements the Set interface, this is possible. It works the same way, but some developers prefer this style because it gives them more flexibility to change the type later.
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