Java, Java, Java is an open source Java textbook licensed under CC-BY 4.0. This repository contains the book's tex and image files and instructions (README) on how to generate the book in PDF form.
The book's website is at: http://www.cs.trincoll.edu/~ram/jjj/
The book is listed on the University of Minnesota's Open Textbook Library:
https://open.umn.edu/opentextbooks/BookDetail.aspx?bookId=218