Organizational Research By

Surprising Reserch Topic

Experts Most Trusted Topic


boostr.in questions - Question:What are differences between Enumeration, ArrayList, Hashtable and Collections and Collection?


Enumeration: It is series of elements. It can be use 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 ‘List’ 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.


asked Sep 13, 2013 in Core java by rajesh
edited Sep 12, 2013
0 votes
18 views



Related Hot Questions



Government Jobs Opening


...