Web Reference: This interface provides two methods to remove interior elements, removeFirstOccurrence and removeLastOccurrence. Unlike the List interface, this interface does not provide support for indexed access to elements. 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...
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