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For code for double ended queues, or code that wouldn't nearly be the same without a deque. Not for code that merely happens to use a deque incidentally but whose real focus is something else.

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Deque implementation with array in Java

public Deque() { // construct an empty deque size = 2; a = (Item[])new Object[size]; itemCount = 0; head = 0; tail = 0; } public boolean isEmpty() { … // is the deque empty? …