Java How to Program, Early Objects, 11th Edition

... 8883 Starting parallelSort Total time in milliseconds: 2143 sort took 315% more time than parallelSort

Comparing performance of Arrays methods sort and parallelSort.

Creating the Arrays

Line 14 uses Random method ints to create an IntStream of 100,000,000 random int values, then calls IntStream method toArray to place the values into an array. Line 15 calls method clone to make a copy of array1 so that the calls to both sort and parallelSort work with the same set of values.

Timing Arrays Method sort with Date/Time API Classes Instant and Duration

Lines 19 and 21 each call class Instant’s static method now to get the current time before and after the call to sort. To determine the difference between two Instants, line 24 uses class Duration