Replacing Hashtable With ConcurrentHashMap in Java

A ConcurrentHashMap can be replaced with Hashtable in Java.

But it requires careful observation, since locking behavior of Hashtable is different than that of ConcurrentHashmap.

A Hashtable locks whole Map instead of a portion of Map. Compound operations like if(Hashtable.get(key) == null) put(key, value) work in Hashtable but not in ConcurrentHashMap.

In a ConcurrentHashMap we use putIfAbsent() method for such a scenario



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