12. The historical collection classes are those classes which were supplied with the earlier version of
Java. They are Vector, Stack, etc.
13. The Vector class implements a growable array of objects, but can store heterogeneous data elements.
Like an array, it contains components that can be accessed using an integer index. However, the
size of a Vector can grow or shrink as needed to accommodate adding and removing items after the
Vector has been created.
14. The Enumeration interface allows one to iterate through all the elements of a collection.
15. The Stack class represents a last-in-fi rst-out ...
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