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. HashSet does not allow duplicate elements. Uses HashMap internally which is an implementation of hash table data structure. Also implements Serializable and Cloneable interfaces. HashSet is not thread-safe. To make it thread ... 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. Iterating over this set requires time proportional to the sum of the HashSet instance's size (the number of elements) plus the "capacity" of the backing HashMap instance (the number of buckets).
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