Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is …

It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value.

Sep 18, 2025 · A HashMap is a part of Java’s Collection Framework and implements the Map interface. It stores elements in key-value pairs, where: Keys are unique. If we try to insert a …

Jan 16, 2025 · In this tutorial, we’ll see how to use HashMap in Java, and we’ll look at how it works internally. A class very similar to HashMap is Hashtable. Please refer to a couple of our …

The HashMap class provides the functionality of the hash table data structure in Java. In this tutorial, we will learn about the Java HashMap class and its various operations with the help of …

Aug 9, 2024 · In this article, I will introduce you to HashMap s in Java. We will explore the common operations of HashMap and then delve into how it operates internally. You will gain …

Dec 5, 2024 · The HashMap, part of the Java Collections framework, is used to store key-value pairs for quick and efficient storage and retrieval operations. In the key-value pair (also …

Apr 9, 2025 · This blog provides a complete guide to HashMap in Java, covering its key features, commonly used methods with examples, internal working, and performance details. Learn how …

Sep 3, 2025 · In this Java tutorial, we will learn about HashMap in Java, including its hierarchy, creating a HashMap, Java HashMap Constructors, adding and accessing elements, iterating …

Jul 11, 2025 · HashMap class implements Map interface which allows us to store key. hashMap is a part of the java collections framework been up since Java 1.2. It internally uses hashing …