I needed books to learn GUI in Java

Answer 1

I don't know book titles but look for Java's GUI-Toolkit: Swing or JavaFX.

Answer 2

http://www.openculture.com/freeonlinecourses#Computer Science Courses

https://www.ted.com/talks/shai_reshef_a_tuition_free_college_degree

www.coursera.org

www.stackoverflow.com

https://news.ycombinator.com/item?id=15828935

https://www.42.us.org/

https://www.appacademy.io/

https://www.sololearn.com/discuss/510275/?ref=app