Collection Framework, legacy and concurrent
links: – http://javarevisited.blogspot.com/2011/04/difference-between-concurrenthashmap.html – http://stackoverflow.com/questions/40471/differences-between-hashmap-and-hashtable – http://ria101.wordpress.com/2011/12/12/concurrenthashmap-avoid-a-common-misuse/ summary: First in 1.0, we have legacy collection like Vector and HashTable. They …