Final answer:
After executing head = head.getLink() on a linked list with only one node, the head reference will be set to null, signifying the end of the list.
Step-by-step explanation:
When working with a linked list, the head reference usually points to the first node in the list. Since there is only one node in this linked list, head.getLink() would typically return the link of the next node. However, as there is no next node in this case (because the list consists of only one node), head.getLink() will return null, effectively making head equal to null. This indicates the end of the list and that there are no more nodes to traverse.