Map and HashMap in Java - A Complete Guide

Published: 15 April 2025
on channel: Павел Сорокин

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In this video, you'll learn how to work with the Map collection in Java. Simple and clear examples. We'll cover:
What is a Map and why is it needed?
How to create and initialize a HashMap using generics
How to add elements using the put method
How to check for the presence of keys and values (containsKey, containsValue)
How to retrieve data by key
How to update values (put, replace, putIfAbsent)
How to remove elements using remove
How Maps differ from other collections

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