Nov 22, 2025 · 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 example creates two HashSet<T> objects and populates them with even and odd numbers, respectively. A third HashSet<T> object is created from the set that contains the even numbers.

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 …

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.

Dec 11, 2017 · In this article, we outlined the utility of a HashSet, its purpose as well as its underlying working. We saw how efficient it is in terms of usability given its constant time …

Oct 29, 2025 · HashSet in Java is a collection class used to store unique elements, where duplicates are not allowed and the order of elements is not preserved. It is part of the Java …

May 21, 2025 · HashSet is a class in Java‘s Collections Framework that implements the Set interface. At its core, HashSet stores elements in a hash table, which is essentially an array …

Jun 24, 2025 · Learn how HashSet works in Java. Understand its internal structure, performance characteristics, and practical use cases.

This tutorial will cover all methods of HashSet with examples and outputs, highlighting key points, use cases, best practices, performance considerations, and a real-time example with CRUD …

In this tutorial, we will learn about the Java HashSet class. We will learn about different hash set methods and operations with the help of examples.