Hashmap in java: In this article

In this article, we will understand the internal workings of the HashMap in Java , also how the get () and put () method functions, how hashing is done, how key-value pairs are stored and how the values are retrieved by keys. Basic Structure of a HashMap HashMap contains an array of Node objects. Each node represents a key-value mapping. This process is defined below: class Node { int hash; K key; V value; Node next; } Each node stores, hash: the hash code of the key key: the key object value ... Introduction In this article, you will learn what is a HashMap , how to create a HashMap , how to add new key-value pairs to a HashMap , how to remove keys from a HashMap , how to iterate over a HashMap , and how to create and store user-defined objects as keys in a HashMap , and much more. The HashMap class in Java is part of the Java Collections Framework and implements the Map interface. It provides the basic implementation of the Map interface of Java and is used to store data in the form of ... The HashMap , part of the Java Collections framework, is used to store key-value pairs for quick and efficient storage and retrieval operations.