Java Hashtable, HashMap, ConcurrentHashMap – Performance impact

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There are a good number of articles that articulate functional differences between HashMap, HashTable, and ConcurrentHashMap. This video compares the performance behavior of these data structures through practical examples. If you don’t have the patience to watch the entire video, here is the bottom line: When you confront with the decision of whether to use HashMap or HashTable, or ConcurrentHashMap, you can consider using ConcurrentHashMap since it’s thread-safe implementation, without compromise in performance.

If you liked this video, you'll love our Java Performance Masterclass. Learn more:

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Topics covered:

0:23 - Performance Study
7:10 - Java Hashtable, HashMap, ConcurrentHashMap Performance Comparison
10:20 - Why Hashtable is so slow?
14:40 - Conclusion

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Links shared in the video:

Hashtable source code here:

fastThread Report:

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