Using threads and AtomicInteger
From Groovy you can use all of the normal concurrency facilities in Java and combine them with threads and closures as necessary. E.g. from a Groovy example http://www.thecoderscorner.com/articleGen/show/4?page=2:
Fibonacci with Executors
A Groovy script to naively calculate the Fibonacci series inspired by the example here.
Note: a version using memoizing will be much more efficient but this illustrates using Java's built-in concurrency primitives from Groovy.
Which produces this:
If you want to convince yourself that some threads are actually being created, replace the last
each line with:
which will add something like the following to your output:
Fibonacci with Functional Java
If you wish to make use of the functionaljava (tested with 2.1.3) library (see the link to the original example), you could use a Groovy program such as this: