Design patterns implemented in Java
Just Announced - "Learn Spring Security OAuth":
Everything you need to know to get the job.
All Algorithms implemented in Java
FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.
MIT Deep Learning Book in PDF format (complete and parts) by Ian Goodfellow, Yoshua Bengio and Aaron Courville
Modern Java - A Guide to Java 8
LeetCode of algorithms with java solution(updating).
A list of useful Java frameworks, libraries, software and hello worlds examples