This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You can create a list of the Map.Entry objects in the Map and sort them with a custom Comparator. See the link to the API docs in my sig for information on the Map.Entry class and the Comparator interface.