More in The Data Structures series. In the previous post, we saw how we can implement Single Linked List in Java. In this post, we'll see how we can extend that and implement a double linked list. The difference between a Single Linked List (SLL) and a Double Linked List (DLL) is that in DLL we have links to both the previous and the next node in the list. In SLL, we only have a pointer to the next node. So in DLL, we have the advantage of traversing the list in both the forward and reverse direction. This adds a lot more flexibility in the linked list. This ins't very much difficult once we have the SLL implementation done. So let's