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 roughly equivalent …

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.

Nov 27, 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. and Values can be duplicated. …

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 other articles …

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 an understanding …

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 examples.

Learn how to efficiently use Java HashMap for storing key-value pairs with examples, syntax, and best practices.

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 over a …

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 roughly equivalent …

Learn about Java HashMap, its methods, and how to use it effectively for storing key-value pairs in your applications.