The Java array class offers a simple to use function for this approach. If we want to increase the capacity of our numbers array from 10 to 20 we can use the following code: ...

Once we have the main array broken, we send list1 and list2 to the ForkJoinSumArrayTask, then we fork the task1, which executes the compute() method and the other part of the array in parallel.

Use Java assertions to test your assumptions about program correctness and check them in your code.