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 …

Oct 31, 2025 · In this blog, we will explore what the Java HashMap is, including coding examples, their benefits, and potential disadvantages. A Java HashMap stores key-value pairs where each key is …

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 referred to as an …

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.

The HashMap class uses a hashtable to implement the Map interface. This allows the execution time of basic operations, such as get ( ) and put ( ), to remain constant even for large sets. Following is the …

Apr 1, 2025 · This Java Hashmap Tutorial Explains What is a HashMap in Java and How to use it. It includes How to Declare, Initialize, Iterate, Implement & Print HashMap.