What is the difference between a ConcurrentHashMap and a Hashtable in Java?
Which is more efficient for threaded applications?
What is the difference between a ConcurrentHashMap and a Hashtable in Java? Which is
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What is the difference between a ConcurrentHashMap and a Hashtable in Java?
Which is more efficient for threaded applications?
ConcurrentHashMapuses multiple buckets to store data. This avoids read locks and greatly improves performance over aHashTable. Both are thread safe, but there are obvious performance wins withConcurrentHashMap.When you read from a
ConcurrentHashMapusingget(), there are no locks, contrary to theHashTablefor which all operations are simply synchronized.HashTablewas released in old versions of Java whereasConcurrentHashMapis a java 5+ thing.HashMapis the best thing to use in a single threaded application.