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deepti sharma

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What are differences between Enumeration, ArrayList, Hashtable and Collections and Collection?

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January 9, 2012 at 11:02 AM

Enumeration : It is series of elements. It can be use to enumerate through the elements of a vector, keys or values of a hashtable. We can not remove elements from Enumeration.

ArrayList : It is re-sizable array implementation. Belongs to 'List' group in collection. It permits all elements, including null. It is not thread safe.

Hashtable : It maps key to value. We can use non-null value for key or value. It is part of group Map in collection.

Collections : It implements Polymorphic algorithms which operate on collections.

Collection : It is the root interface in the collection hierarchy.

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