A lot of people ask for a good book for Java so here's one.
Java Beginner's Guide (from Oracle itself)
Amazon - /Java-Beginners-Guide-Edition-INKLING-ebook/dp/B00J4XLILY/ref=dp_ob_title_def
Sorry cant post link yet
A simple book that helped ...
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?