Which collection interface is efficient to implement the singly and doubly linked list in java? code sample please?
The right interface to implement a doubly-linked list is, unsurprisingly, a LinkedList. See the JavaDoc .
I'm not going to give you a code sample here; they're all over the web and you could find one with two minutes' research.
If you want a singly-linked list for some reason, you're probably going to have to roll your own using a custom Node class. Each Node should just have a data object and a pointer to the next Node.
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