Timing in Java
20 February 2004
1,998 Views
2 Comments
Here is a simple (homegrown) Timer class that I use to capture execution time in Java:
import java.io.PrintStream;
final class Timer
{
private long startTime;
private long endTime;
public Timer()
{
reset();
}
public void start()
{
System.gc();
startTime =
System.currentTimeMillis();
}
public void end()
{
System.gc();
endTime =
System.currentTimeMillis();
}
public long duration()
{
return (endTime - startTime);
}
public void printDuration( PrintStream out )
{
long elapsedTimeInSecond =
duration() / 1000;
long remainderInMillis =
duration() % 1000;
out.println("\nTotal execution time:"
+ elapsedTimeInSecond
+ "."
+ remainderInMillis
+ " seconds");
}
public void reset()
{
startTime = 0;
endTime = 0;
}
public static void main( String[] args )
{
Timer timer = new Timer();
timer.start();
for (int i = 0; i < 500; i++)
{
System.out.print("#");
}
timer.end();
timer.printDuration(System.out);
}
}
This worked for me, thanks!
Why do you have System.gc() in the end() method? I didn’t see the point of that one.
I probably had a good reason for the System.gc() 4 years ago when I posted this, but I can’t think of the reason off the top of my head now.
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