2010年5月14日 · 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.

2009年8月18日 · 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 …

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 …

2011年8月9日 · Why there is no ConcurrentHashSet against ConcurrentHashMap Asked 14 years, 2 months ago Modified 1 year, 7 months ago Viewed 350k times

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 …

2009年2月4日 · The ConcurrentHashMap uses very sophisticated techniques to reduce the need for synchronization and allow parallel read access by multiple threads without synchronization …

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 …

What is the difference between a ConcurrentHashMap and a Hashtable in Java? Which is more efficient for threaded applications?

2010年9月22日 · In javadoc for ConcurrentHashMap is the following: Retrieval operations (including get) generally do not block, so may overlap with update operations (including put …