Here are some useful links about Java.
General
- Operating System Information
- Summary of Operators
- Setting JDK 7 as default
- How do I view JRE's source code in Eclipse on linux (debian)
- Modern Java - A Guide to Java 8
- Where can I find JavaEE packages' sources?
Concurrency
- Java et la synchronisation
- Programmation des threads en Java
- Java & Threads
- Sémaphores et Mutex en Delphi et Java
- Cours Thread et Communication en Java
- Introduction à la programmation concurrente en Java