Just looking for a book to help me with the upgrade exam, not the full exam 1Z0-809.
Have you considered re-releasing the book with the material from your Java 7 book that you removed?
Will your book help me study for this exam?
Are the books (Java the complete reference 9th Edition) with (java 8 in action) enough ?
what classes / constructs are important to master when studying concurrency for the certification?