#Stopwatch This is a class that allows you to determine the execution time of an algorithm. You can get specific resolutions of time through their own get functions, all of which return double. However I have built it a function, getStr(), that automatically chooses the best resolution and returns both the number and resolution as a string. This is used extensively in my ProjectEuler code found at https://bitbucket.org/Mattrixwv/ProjectEuler Example of usage: Stopwatch timer = new Stopwatch(); timer.start(); //Code to time here timer.stop(); System.out.printf("It took %s to run this algorithm", timer.getStr()); //You could also do something like this if you prefered System.out.printf("It took %f milliseconds to run this algorithm", timer.getMilli());