What are the differences between ArrayDeque and LinkedList in Java?

What are the differences between ArrayDeque and LinkedList in Java?

ArrayDeque is a resizable array implementation of the Deque interface, while LinkedList is a doubly-linked list implementation. ArrayDeque offers faster access times for adding and removing elements at both ends, while LinkedList provides better performance for inserting and removing elements in the middle.

Which one should I use for a queue implementation?

If you need a simple queue with fast access times, ArrayDeque is generally preferred due to its better performance in most scenarios. However, if you require frequent insertions and deletions from the middle of the queue, LinkedList might be more suitable.

Are there any memory considerations I should be aware of?

Yes, ArrayDeque may use more memory due to its underlying array, which can lead to wasted space if the array is not fully utilized. LinkedList, on the other hand, has a higher overhead per element due to storing pointers for each node.

Can you give me an example of how to implement both?

Sure! For ArrayDeque, you can use ArrayDeque<Type> queue = new ArrayDeque<>();. For LinkedList, it's LinkedList<Type> queue = new LinkedList<>();. You can then use methods like add(), remove(), and peek() on both.