Java interview question on hashcode() and equals() || Java collection interview questions on HASHMAP

This tutorial covers a very popular java interview question on hashcode and equals method in java.By asking this question interviewer checks your understanding of java collections and wrapper class together. So this tutorial covers few questions like : 1) how to stop duplicate entry to a hashmap with respect to a customized class 2) How the duplicate entry is getting rejected in a map with respect to a wrapper class. 3) Comparison between a customized class and a wrapper class map size. So as we know the two most important java object class methods are hashcode and equals and they have a various impact when it comes to java collection. Soon I am going to release another tutorial on java hashcode and equals method, where we are going to learn everything from scratch.To get a notification for that tutorial please subscribe to my channel by clicking the below link.    / @seleniumexpress   Stay tuned and like my Facebook page for more.   / seleniumexpress   Music : ----------- credits : - 1) Adventures by A Himitsu   / a-himitsu   Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music released by Argofox    • A Himitsu - Adventures [Royalty Free Music]   Music provided by Audio Library    • Adventures – A Himitsu (No Copyright Music)   2) NCM Epic Music Ender Guney    / ncmepicmusic   ----- intro template : wwww.youtube.com/Alexbau01