Web Reference: Mar 24, 2026 · ArrayDeque is a resizable-array implementation of the Deque interface in Java. it allows elements to be added or removed from both ends efficiently and it not allow null element insertion . 1. Add elements using add(), addFirst() and addLast() 1. add()- inserts the specified element at the end of the array deque 2. addFirst()- inserts the specified element at the beginning of the array deque 3. addLast() - inserts the specified at the end of the array deque (equivalent to add()) Note: If the array deque is full, all these methods add(... Jul 24, 2025 · In this tutorial, we’ll show how to use Java’s ArrayDeque class – which is an implementation of the Deque interface. An ArrayDeque (also known as an “Array Double Ended Queue”, pronounced as “ArrayDeck”) is a special kind of a growable array that allows us to add or remove an element from both sides.
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