Map in Java & HashMap example | Java Collections # 9 | Java9s.com

YouTube Excerpt: Download Code: http://java9s.com/core-java/map-in-java-hashmap-java-example Map in java has a key and value pair objects. The combination of this Key and value pair is called an ENTRY With respect to Hierarchy, Map does not come under normal collections. The reason is, All other collections like List, Set, Queue deal with elements where there is a single object at a level, Where as Map works with key value pairs. Due to this new model, Map needs differnt set of methods to work with entries and this is the reason why Map does not extend collection interface. One of the Important rules we got to remember while using Map based datastructures is that - They do not allow duplicates as part of the keys. In this video tutorial, i have explianed the concept of Map and its concrete implementation with HashMap Example I have also mentiond about HashTable and how it is synchronized. Java Collections Tutorials Playlist: Complete Java Beginners Tutorials: https://www.youtube.com/playlist?list=PLkiVxfkxAYd1Typb8x-2nbzgsxdMQesKg Multithreading in Java tutorial: https://www.youtube.com/playlist?list=PLkiVxfkxAYd1i9eX9X74eoTjKZXzvITMX Spring 3 MVC Framework tutorials: https://www.youtube.com/playlist?list=PLA3AD4211EBE70E86 Spring Framework Tutorials: https://www.youtube.com/playlist?list=PL2882729612B70122 Design Patterns in Java: https://www.youtube.com/playlist?list=PLkiVxfkxAYd1xWYj9aOWoTevqok0VoYe7 Complete Generics Tutorials playlist https://www.youtube.com/playlist?list=PLkiVxfkxAYd2TAn--1BH1ERvYbHxh11Qs

Download Code: http://java9s.com/core-java/map-in-java-hashmap-java-example Map in java has a key and value pair objects. The combination of this...

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