Looking for the right List...

Hi there!
I want to use a List class to hold a potentially large number of elements. I don't care about randomly accessing elements; only Iterators will be used to iterate through the List. What I mostly care about is storage overhead and garbage collection.
ArrayList and Vector have the problem of re-allocating memory and copying their internal array as you add elements - in case you don't know the exact number beforehand, which is my case.
On the other hand, LinkedList creates a new object for each element you put in the List. All these objects will have to be garbage collected at some time, and this takes resources. In my case, I could have 10s or 100s of objects, each creating its own List with 10s or 100s of objects.
So, essentially, I'm looking for the best trade-off. Anybody done some stress-testing?
Thanks a lot!
Vagelis

Well... it depends.
If you know up front how many entries there are going to be in each list and the lists are fairly stable then you'd be best off going with an ArrayList. If there's a lot of addition and removal of items in the list and you have no clue how many objects there are going to be in each list, then you might be better with a LinkedList. It may also depend on how you remove entries from the list (by index or by object value) or whether you just throw a whole list away and start again.
Personally I've used ArrayLists of ArrayLists containing 10s or 10000s of objects and "been okay", by which I mean this has never been the performance bottleneck in my system.
In extremis (particularly if performance is really critical and you know quite a lot about how your objects are to be organised) it might be more sensible to roll your own implementation (for example, if an object appears only in one list at a time then it could be made "Listable" and hold its own forward and backward references to aid in its insertion in a linked list).
If you can give some more information on the exact required behaviour then people can help more.
In the meantime my recommendation is to use an ArrayList and if performance becomes a problem, profile the execution later and consider switching.

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hi,
i'm my nw8440 mobile workstation (T7400, FireGL V5200, 15.4" WUXGA) seems to have some northbridge issues and i'm looking for mobo replacement.
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This question was solved.
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Hi @macrionitis ,
Thank you for visiting the HP Support Forums. I needed to edit your post and remove the image with the Serial Number. In accordance with our Rules of Participation:
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If you need people to contact you directly, either ask them to send you a private message or subscribe to the thread so you will be notified when there are replies. You may also click on your name anywhere in the forum and you will be taken to your profile page, where you can find a list of threads you have participated in.
Sharing personal email addresses, telephone numbers, and last names is not not permited for your safety. If you have any questions feel free to send me a private message in reply.
Thank you
George
I work for HP

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Thanks for the reply. I use that forum. I thought it was different from the rest of the MS forums. Unfortunately sometimes someone will answer a question with a meaningless response, but it appears to have been answered by others and is ignored from that
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Or if you like it quick and dirty you could mess up a Panel
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Greetings -
I just recently purchased CS5 Production Premium and I want to use Premiere to create slideshows with still camera shots.
My source is RAW images (.NEF). I process them in Lightroom 3 and I export them in .Tif or .Psd formats ranging in size from 1920x1080 to 4288x2412 for use in Premiere.
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Thanks!

Thanks for the fast response.
The WD will handle 1920x1080p which matches my HD TVs.
Looking at the choices presented for presets I see that the following have 1920x1080p settings:
AVCHD
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Digital SLR
Red R3D
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Hello, I am a casual photographer and really just learning this great hobby. I got into it trying to get good pictures of my daughters during their ballet performances. Each step I've taken has got me a little closer to getting good pictures of them but I'm quickly running out of time. My last step was to purchase a T4i. I mainly use the kit lens 18-55 for most of the shots of them and sometimes the 55-250 if I want to get close in. I generally crank up the ISO so I can use a faster shutter speed. I find that ISO 6400 with a shutter speed of 1/400 in general is giving me the best results but not anywhere near perfect. I've pinballed around looking at lenses and my head is swimming and frankly I don't know enough to make a great desicision. The current lens I'm looking at is the Canon EF 24-105 f/4 IS USM. The other two lenses I own both go to 5.6 and I was hoping the fixed f/4 would let in more light letting me reduce the ISO for a less grainy picture. Going back and looking at most of my shots I'm usually in the 30-50mm range but that can change depending on where I get to sit at each show so a zoom lens is mandatory for me. I really want to stay around $500 to $600 if at all possible and think I can get that lens at that price range.
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OK let's give this s go.
If you are shooting a f5.6 at ISO 6400 and you decide to get an f4 lens, you will be able to shoot the same scene at ISO 3200. That lens is one stop faster. Not a big deal. But, on-the-other hand if you got a f2.8 lens you are talking another stop off. The ISO would now be 1600. Pretty good, I'd say.
Unfortunaltely an f2.8 lens isn't going to be cheap. Sigma has a 17-50mm f2.8 and even better a 18-35mm f1.8. The f1.8 will allow you to drop more than another stop off your ISO to around 640. Generally speaking the lower the ISO, the less noise in the photo and the better it will look. But these are a little short of the mm (focal length) you say you need.
Any of these lenses, and the outstanding EF 24-105mm f4 will make way better pictures than your current kit lenses do. Tamron also has some choices in this area, too.
The ideal choice would be a 24-70mm f2.8 but they are going to be way more expensive. The Sigma being the cheapest in this bunch, again. The Canon EF 24-70 f2.8 L IS being the best lens there is, period, and a price tag to prove it.
The EF-S 18-135mm is a better lens than what you have but is not going to help the ISO problem. You need, one, more light on the subject or, two, a faster lens.
Another idea!
If you can live with a fixed focal lemgth, or prime, lens, you could get the EF 50mm f1.8 or better yet the EF 50mm f1.4.. Now were're taling. f1.4 is four stops faster and your ISO would drop to 400. Around $110 bucks and $350 respectively. Sound good?
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Sigma has some great primes, too.
EOS 1Ds Mk III, EOS 1D Mk IV EF 50mm f1.2 L, EF 24-70mm f2.8 L,
EF 70-200mm f2.8 L IS II, Sigma 120-300mm f2.8 EX APO
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http://www.dragonframe.com/
http://www.stopmotionpro.com/
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