public class Stopwatch extends Object
Stopwatch
data type is for measuring
the time that elapses between the start and end of a
programming task (wallclock time).
See StopwatchCPU
for a version that measures CPU time.Constructor and Description 

Stopwatch()
Initializes a new stopwatch.

Modifier and Type  Method and Description 

double 
elapsedTime()
Returns the elapsed CPU time (in seconds) since the stopwatch was created.

static void 
main(String[] args)
Unit tests the
Stopwatch data type. 
public double elapsedTime()
public static void main(String[] args)
Stopwatch
data type.
Takes a commandline argument n
and computes the
sum of the square roots of the first n
positive integers,
first using Math.sqrt()
, then using Math.pow()
.
It prints to standard output the sum and the amount of time to
compute the sum. Note that the discrete sum can be approximated by
an integral  the sum should be approximately 2/3 * (n^(3/2)  1).args
 the commandline arguments