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neelam
Java collection
1 Answer(s)      4 years ago
Posted in : Java Interview Questions


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

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October 18, 2010 at 6:11 PM


Hi,

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

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

Hashtable: It maps key to value. You 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.

Thanks.



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