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JDK 1.5 introduces some good concurrent collections which is highly efficient for high volume
http://javarevisited.blogspot.com/2011/04/difference-between-concurren...
Tutorial Statistics
The synchronized collections classes, Hashtable and Vector, and the synchronized wrapper classes, Collections.synchronizedMap and Collections.synchronizedList, provide a basic conditionally thread-safe implementation of Map and List. However, several factors make them unsuitable for use in highly concurrent applications for example their single collection-wide lock is an impediment to scalability and it often becomes necessary to lock a collection for a considerable time during iteration to prevent ConcurrentModificationException More detail...
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