ConcurrentHashMap in Java Multithreading

ConcurrentHashMap provide an optimal solution for this problem.
It is a HashMap just like its standard version and used to store the key-value pairs which works on top of Hashtable.

So everything else is same as HashMap with just one difference.

It allows concurrent access to the map. Map is divided into multiple parts known as Segments.

It handles read and write operations differently, any number of threads can read the data without needing any lock on any of the segment.
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You can access the specific topic from the chapters given below

0:00 Why we need Concurrent Collections?
0:57 Convert HashMap to Concurrent
1:56 How ConcurrentHashMap Helps?
2:25 How ConcurrentHashMap Works Internally?
3:00 Creating object of ConcurrentHashMap
4:35 Example
6:16 Use-cases

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[wescayande]

Thanks for the very efficient introduction.

[srinivasseenu]

The segmentation was there till java 7 its been replaced with a lock-free bucket-based design using CAS (Compare-And-Swap) and synchronized blocks. This is misleading.