Simple runtime comparison

[Hosh Nasi]

I want to do a simple runtime test on a program I just completed. I am going to iterate through it 1000 times and I want to capture the time at start and at end then subtract them to determine how long the program ran.

I want to basically run it for enough time to see what performance issues it has. Say garbage collection.

thanks!

[Stan James]

Look at System.currentTimeMillis(). This is very common:

long before = System.currentTimeMillis();
... do some work ...
print "that took " + System.currentTimeMillis()-before + " milliseconds";

[Hosh Nasi]

I was hoping it would be that easy.. Thanks!

[Layne Lund]

So what part of this do you need help with exactly? I assume you need to know how to get the current time at the beginning and end of your program. Is that correct? With a little bit of work, you can find help with such things by browsing the Java API documentation. In particular, you can use java.util.Date. Its default constructor initializes the Date object with the current time.

I guess you also need to find a way to subtract the beginning and ending time. Unfortunately, I haven't found anything yet, but if you browse through the above links, you might be able to find something that I'm missing.

Good luck!

Layne