Java Practice-It || 16.6 hasTwoConsecutive (pt.1) || implementing, ListNodes, LinkedLists

Question:

[1, 18, 2, 7, 8, 39, 18, 40]
If the list had stored the following sequence of values, then the method should return false:

[1, 18, 17, 2, 7, 39, 18, 40, 8]
This sequence contains some pairs of numbers that could represent consecutive integers (e.g., 1 and 2, 7 and 8, 39 and 40), but those pairs of numbers are not adjacent in the sequence. The list also has a pair of adjacent numbers (18, 17) that are not in the right order to be considered consecutive. You may not make any assumptions about how many elements are in the list.

Assume that you are adding this method to the LinkedIntList class as defined below:

public class LinkedIntList {
private ListNode front; // null for an empty list
...
}

Problem: