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[java] while (...) Object o = it.next() or Object o while (...) o = it.next()

Started by tufflax May 20, 2006 at 8:28 AM 2 replies 600+ views

Original Post

May 20, 2006 at 8:28 AM

Hey! I was just wondering if there is any difference in speed if one does, for example:


Iterator it = list.iterator();
while (it.hasNext()) {
    Object o = it.next();
}

compared to


Iterator it = list.iterator();
Object o;
while (it.hasNext()) {
    o = it.next();
}

choffstein

May 20, 2006 at 8:30 AM

Probably not. I bet those guys at Sun optimized their compiler well enough to fix your bad code. Look for the big bottlenecks in your application, not these micro-optimizations.

Fred304

May 20, 2006 at 8:33 AM

Don't micro-optimise, make your code readable.

for (Object o : list){}

tufflax

May 20, 2006 at 8:40 AM

Thanks!

Yes, that's what I would bet too, but I wanted to make sure.

And yes, the for-each loop in definatly nicer but I just wanted an example. Thanks again!

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