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 · 7 ConcurrentHashMap uses finer-grained locking mechanism known as lock stripping to allow greater degree of shared access. Due to this it provides better concurrency and scalability. …

However, although ConcurrentHashMap is a thread-safe drop-in replacement for HashMap, it is important to realize that if you are doing multiple operations you may have to change your code …

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 …

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 …

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, …

There is a new computeIfAbsent API introduced in Java 8. The javadocs for ConcurrentHashMap's impelementation of it state: If the specified key is not already associated with a value, attempts to

ConcurrentHashMap<Integer,String> identificationDocuments = new ConcurrentHashMap<Integer,String>(); identificationDocuments.put(1, "Passport"); …

Mar 4, 2015 · Since the ConcurrentHashMap offers a few important extra methods that are not in the Map interface, simply wrapping a LinkedHashMap with a synchronizedMap won't give you the same …