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. This class implements the Set interface, backed by a hash table (actually a HashMap instance). It makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time. 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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