May 14, 2010 · What is the use of ConcurrentHashMap in Java? What are its benefits? How does it work? Sample code would be useful too.

The ConcurrentHashMap is very similar to the java.util.HashTable class, except that ConcurrentHashMap offers better concurrency than HashTable or synchronizedMap does. …

Aug 18, 2009 · What is the difference between using the wrapper class, SynchronizedMap, on a HashMap and ConcurrentHashMap? Is it just being able to modify the HashMap while iterating it …

Aug 9, 2011 · But ConcurrentHashMap is implemented using non-blocking algorithms and "low-level" synchronisations without any locks of the whole collection. So wrapers from …

The get() method is thread-safe, and the other users gave you useful answers regarding this particular issue. However, although ConcurrentHashMap is a thread-safe drop-in replacement for HashMap, it …

How is the performance of ConcurrentHashMap compared to HashMap, especially .get () operation (I'm especially interested for the case of only few items, in the range between maybe 0-5000)? Is there...

Use ConcurrentHashMap only when the class where it's being used is thread safe; otherwise the use of a thread safe data structure in a non thread safe class adds to the confusion of the next person …

Sep 22, 2010 · In javadoc for ConcurrentHashMap is the following: Retrieval operations (including get) generally do not block, so may overlap with update operations (including put and remove). Retrievals …

I was reading the article "Java theory and practice: Building a better HashMap" that gives an excellent overview about the implementation of ConcurrentHashMap. I also found some discussions over ...

Feb 4, 2009 · The ConcurrentHashMap uses very sophisticated techniques to reduce the need for synchronization and allow parallel read access by multiple threads without synchronization and, …