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 …

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 …

Aug 9, 2011 · Prior to Java 8, you produce a concurrent hash set backed by a concurrent hash map, by using Collections.newSetFromMap(map) In Java 8 (pointed out by @Matt), you can …

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 …

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 …

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 …

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 …

Feb 4, 2009 · ConcurrentHashMap was presented as alternative to Hashtable in Java 1.5 as part of concurrency package. With ConcurrentHashMap, you have a better choice not only if it can …