OutOfMemory??? With an huge array how I can avoid it??

In runtime i got the OutOfMemoryError (or exception... I don't remember) when bulding an huge array... So i would like to know which dimension has usually the heap memory, if it depends from the machine you're using, and how i can avoid that error, without creating a List...
I need the array to create a simple program for school wich will split a file in n parts, so I need to use an array of bytesn but if the file bigger than about 50mb it appears the OutOfMemory above...
Any suggestions accepted (you'll see i'm a newbie), Thanks

In runtime i got the OutOfMemoryError (or
exception... I don't remember) when bulding an huge
array... So i would like to know which dimension has
usually the heap memory, if it depends from the
machine you're using, and how i can avoid that error,
without creating a List...A list is unlikely to take less room than an array.

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