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A LinkedList is ordered by index position, like ArrayList, except that the elements are doubly-linked to one another.

Could someone please help to understand the term doubly-linked.

Thanks
 
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It's more of an implementation detail than anything else.

In a linked list, every element points to the next element in the list. The list is traversed by asking each element where the next one is. If a list is doubly-linked, it means each element also point to the previous element in the list, making it possible to traverse the list backwards.
 
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