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This article will explain in detail when to use ConcurrentHashMap, the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

CHM applies when the number of readers exceeds the number of writers.

When the number of writers is greater than or equal to the number of readers, the performance of CHM is lower than Hashtable and synchronized Map.

This is because when the entire Map is locked, the read operation waits for the thread that writes to the same part to finish.

CHM is suitable for cache.

Initialized when the program starts and can then be accessed by multiple requesting threads.

As Javadoc explains, CHM is a good alternative to HashTable

But keep in mind that CHM is slightly less synchronized than HashTable.

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