Think Java is a free textbook by Allen B. Downey and Chris Mayfield.
available under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

This app is for study Java and for personal only.
app provides a comfortable reading interface and add index to easy read and study.

Since the beginning, this book has under a license that allows users to copy,distribute and modify the book. Readers can download the book in a variety of formats and read it on screen or print it. Teachers are free to print as
many copies as they need. And anyone is free to customize the book for their needs.

Data are retrieved from http://greenteapress.com/thinkjava/