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ArrayDeque

Last Updated : 26 May, 2026

title: ArrayDeque in Java

Collections Framework60 words4 headingsTables includedExamples included

title: ArrayDeque in Java description: ArrayDeque - fast deque implementation

Array based Deque implementation. Stack ya Queue dono ke liye best choice.

Create karna

java exampleWoHoTech

ArrayDeque<Integer> deque = new ArrayDeque<>();
ArrayDeque<Integer> deque2 = new ArrayDeque<>(20); // initial capacity

Stack ke roop mein

ArrayDeque<Integer> stack = new ArrayDeque<>(); stack.push(1); // addFirst: [1] stack.push(2); // addFirst: [2, 1] stack.push(3); // addFirst: [3, 2, 1] stack.pop(); // 3, removes: [2, 1] stack.peek(); // 2, no remove

Queue ke roop mein

java exampleWoHoTech

ArrayDeque<String> queue = new ArrayDeque<>();
queue.offer("First");   // addLast
queue.offer("Second");
queue.offer("Third");

queue.poll();  // "First" (FIFO)
queue.peek();  // "Second" (no remove)

ArrayDeque vs Stack vs LinkedList

	ArrayDeque	Stack	LinkedList
--	--	--	--
Thread Safe	No	Yes	No
Performance	Fastest	Slow	Medium
Null allowed	No	Yes	Yes
Recommended	Yes (modern)	Legacy	When needed

Exam Focus

Revise definitions, diagrams, examples, and short-answer points for ArrayDeque.

Interview Use

Prepare one clear explanation, one practical example, and one common mistake for this Java topic.

Search Terms

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Collections FrameworkDeque Double-Ended Queuetitle: Deque in Java Collections FrameworkPriorityQueuetitle: PriorityQueue in Java Collections FrameworkJava Collections Frameworktitle: Collections Framework Overview Collections FrameworkCollections Practice Programstitle: Collections Programs Collections FrameworkComparable vs Comparatortitle: Comparable vs Comparator Collections FrameworkGenericstitle: Generics in Java

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