Explanation: This program is simple to understand. One important thing to note here is that elements of
HashSet are not ordered and duplicate elements are displayed only once.
18.6.2 TreeSet Class
This class implements the Setand SortedSet interface. As the name implies, the class uses the tree
for storage of its elements. The TreeSet implementation is useful when one needs to extract elements from
a collection in a sorted manner. In order to work properly, elements added to a TreeSet must be sortable.
A tree knows how to keep elements of the java.lang wrapper classes sorted. It is generally faster to add ...
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