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A linear collection that supports element insertion and removal at both ends.
The name deque is shor
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HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
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Defines methods that all servlets must implement. A servlet is a small Java
program that runs within
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Defines a general exception a servlet can throw when it encounters difficulty.
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An interface for the creation of Connection objects which represent a connection
to a database. This
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