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package stdlib;
/* ***********************************************************************
* Compilation: javac Stopwatch.java
*
*
*************************************************************************/
/**
* <i>Stopwatch</i>. This class is a data type for measuring
* the running time (wall clock) of a program.
* <p>
* For additional documentation, see
* <a href="http://introcs.cs.princeton.edu/32class">Section 3.2</a> of
* <i>Introduction to Programming in Java: An Interdisciplinary Approach</i>
* by Robert Sedgewick and Kevin Wayne.
*/
public class Stopwatch {
private final long start;
/**
* Create a stopwatch object.
*/
public Stopwatch() {
start = System.currentTimeMillis();
}
/**
* Return elapsed time (in seconds) since this object was created.
*/
public double elapsedTime() {
long now = System.currentTimeMillis();
return (now - start) / 1000.0;
}
}
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