Question: plese do both of them using java Problem Give an implementation of the method numListElements for the Doubly LinkedList class, that returns the number of

plese do both of them using java

Problem Give an implementation of the method numListElements for the Doubly LinkedList class, that returns the number of elements in the doubly linked list. Assume that we did not maintain size as an instance variable. Problem Sketch (i.e. draw) the work that is needed to swap 2 nodes in a doubly linked list

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