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. 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. This class permits the null element. Java HashSet A HashSet is a collection of elements where every element is unique. It is part of the java.util package and implements the Set interface.
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