Applet or web-start? How can I package a memory intensive app?

Dear All,
I'm new here - I'm learning about Java with a particular project in mind, and looking for advice from people with more experience before I start coding! Your opinions would be very useful.
I would like to write a small scientific application, to be distributed by the web, easy to run as a normal user (without administrator rights), with a good GUI. So Java sounds very good for this. However, the application will be very memory intensive (and quite CPU intensive) with several large arrays. It may require ~1 to 2 Gb of memory at times. I have three simple questions:
1) If I write it as an applet, will my users hit memory 'heap size' limits when they try and run it if it tries to use ~1 Gb memory? Can I control this?
2) If I write it using JNLP (e.g. Sun's Java Web-Start), will my users get memory limit errors if my application tries to use ~1 Gb memory? Can I control this?
3) If more and more people start using the Java browser plugin, will they get Web-Start installed at the same time? Or will Web-start become less common?
Any other advice about this choice, problems with web-start or resource hungry applets would also be gratefully received.
With thanks and best regards,
andy_g
(PS: I'm not worried about the performance of Java compared to other languages - I'm worried about hitting memory limits imposed by the JVM settings or Java language!)

Hi ChuckBing,
Thanks for your reply - it's given me some valuable information. In light of your post I think I'm going to try a very simple test code which does some simple operations with representative big arrays and see if I can get that working well on a range of machines before I spend time writing the real thing. I hadn't appreciated the need for contiguous memory in the Java heap.
As for comparing JNLP and applet memory control, after another intensive bout of google searching, I found more information about controlling heap size for applets at:
https://jdk6.dev.java.net/plugin2/jnlp/
From my (novice) reading of this page, it seems that from 1.6 you can now control the heap available to an applet in a similar manner to JNLP. I've added this link in case other people stumble across this post with a similar questions about applet memory limits.
Thanks again,
andy_g

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