Web Reference: 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. Mar 26, 2026 · Let’s see how to perform a few frequently used operations on the HashSet. 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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