|he Java Collections Framework consists of a number of interfaces and implementa-
tions for handling collections and maps. A collection groups multiple elements into a single
unit. A collection can be implemented as either of the classic data structures, lists or sets. A
list allows duplicates, and maintains objects in the order in which they are added to the list. On
the other hand, a set does not allow duplicates and provides either no particular ordering or
an ordering based on the objects themselves regardless of the order in which they were added.
A map is a grouping of keys and their corresponding values. A map ...
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