Threads

https://javarevisited.blogspot.com/2015/05/top-10-java-multithreading-and.html

http://www.javaworld.com/article/2078679/java-concurrency/modern-threading-for-not-quite-beginners.html

http://stackoverflow.com/questions/10855679/multithreaded-programming-in-java-best-practices-and-code

http://www.slideshare.net/indicthreads/concurrency-best-practices

http://stackoverflow.com/questions/19770721/parallel-execution-of-multiple-threads-in-java