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 …

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 …

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 …

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.

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.

Jan 12, 2026 · Java hashmap a complete tutorial for beginners with examples, methods and functions, explanation of each class from java key value pair to put method. Check out the complete definition, …

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 …