Web Reference: In this session, we'll explore the Deque interface in Java. A Deque, or double-ended queue, is a versatile data structure that allows insertion and removal of elements from both ends. 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 addfirst and offerFirst methods insert elements at the beginning of the Deque instance. The methods addLast and offerLast insert elements at the end of the Deque instance. When the capacity of the Deque instance is restricted, the preferred methods are offerFirst and offerLast because addFirstmight fail to throw an exception if it is full.
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