Web Reference: Mar 24, 2026 · The Deque interface is part of the java.util package and extends the Queue interface. It stands for Double-Ended Queue and represents a linear collection that allows insertion, removal, and retrieval of elements from both ends. The diagram below shows the hierarchy for the double-ended queue or deque. As shown in the below diagram, the Deque interface extends to the Queue interface that in turn extends the Collection interface. To use a deque interface in our program, we have to import the package that holds deque functionality using an import statement as shown below. or... The name deque is short for "double ended queue" and is usually pronounced "deck". Most Deque implementations place no fixed limits on the number of elements they may contain, but this interface supports capacity-restricted deques as well as those with no fixed size limit.
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