# reference

[http://winterbe.com/posts/2015/04/07/java8-concurrency-tutorial-thread-executor-examples/](http://winterbe.com/posts/2015/04/07/java8-concurrency-tutorial-thread-executor-examples/)

[http://www.codejava.net/java-core/concurrency/java-concurrency-understanding-thread-pool-and-executors](http://www.codejava.net/java-core/concurrency/java-concurrency-understanding-thread-pool-and-executors)
