To compile, you can either use javac and do everything manually or you can use the included buildfile with Apache Buildr. Going with Apache Buildr simply run buildr test which will automatically run buildr compile if needed and then run the unit tests using JUnit 4.
Please note that this implementation targets Java 6 and therefore does not use the Fork/Join framework.
This implementation is designed to spawn threads up to a certain threshold and then fall back to recursion in order to avoid the overhead of constant context switching. Here are some sample outputs from the largeTestSort method (output will vary since sorted values are different every time):
:::text
Generation time: 887 (10000000 Integer Objects)
Copy time: 7
Java built in implementation: 4115
Multi-threaded quick sort: 1599
Generation time: 866 (10000000 Integer Objects)
Copy time: 7
Java built in implementation: 4158
Multi-threaded quick sort: 1491
Generation time: 875 (10000000 Integer Objects)
Copy time: 7
Java built in implementation: 4062
Multi-threaded quick sort: 1451