HashMap coding example|java.util

What is HashMap in Java for example?
Where is HashMap used?
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Chapters:
0:00 Introduction to video
0:40 Creation of HashMap example
4:15 Explanation of HashMap keyset with example
4:30 Explanation of entrySet method in HashMap
5:46 Explanation of output in the console window
8:03 Explanation of clear method in HashMap class
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[ashokchavan]

I like the way you use Java 8 in your examples

[kavitachavan]

Really important topic will follow you on

[kavitachavan]

I wasnt aware of clear operation in HashMap good you have highlighted

[kavitasurve]

These are the foundation pillars of collection framework

[ashokchavan]

HashMap internally works on hashing principle

[kavitasurve]

Can you also show the working of HashMap internally