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Do we need a hashtable since we have a ConcurrentHashMap?

Java java.util.Hashtablehas the same functionality as java.util.HashMap. Their main difference is that it Hashtableis thread safe and synchronizes, but HashMapnot. With JDK5 we have ConcurrentHashMapthat can be used for multi-threaded context. It has better performance than Hashtable. Do we have any reason to use it Hashtablein the future?

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Backward compatibility is the only reason it Hashtableis still in the JDK.

In addition, another alternative Hashtableis Collections.synchronziedMap.

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