Web Reference: 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). Java Tutorial #63 - Java HashSet Class with Examples (Set Data Structure) In this video by Programming for Beginners we will learn Java HashSet Class with Examples, using Java Tutorial videos. 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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