Stopwatch.java in pgm

Stopwatch.java

public class Stopwatch

{

            private final long start;

            public Stopwatch()

{

        start = System.currentTimeMillis();

 }

        public double elapsedTime()

       {

        long now = System.currentTimeMillis();

        return (now - start) / 1000.0;

        }

        public static void main(String[] args)

       {

        int N = Integer.parseInt(args[0]);

                    double totalMath = 0.0;

        Stopwatch swMath = new Stopwatch();

        for (int i = 0; i < N; i++)

        {

            totalMath += Math.sqrt(i);

        }

        double timeMath = swMath.elapsedTime();

 

        double totalNewton = 0.0;

        Stopwatch swNewton = new Stopwatch();

        for (int i = 0; i < N; i++)

        {

            totalNewton += Newton.sqrt(i);

        }

                    double timeNewton = swNewton.elapsedTime();

        StdOut.println(totalNewton/totalMath);

        StdOut.println(timeNewton/timeMath);

    }

}