In this example, you created a ForkJoinPool object and a subclass of the ForkJoinTask class that you executed in the pool. To create the ForkJoinPool object, you used the constructor without arguments, so it will be executed with its default configuration. It creates a pool with a number of threads equal to the number of processors of the computer. When the ForkJoinPool object is created, those threads are created and they wait in the pool until some tasks arrive for their execution.
Since the Task class doesn't return a result, it extends the RecursiveAction class. In the recipe, you used the recommended structure for the implementation of the task. If the task has to update more than 10 products, it divides that set of elements ...
