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    What is the type of the array? If you use primitives I doubt the memory usage will be so significant. Commented Aug 22, 2012 at 12:40
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    @amit, object of any type. Before going to do that, I just want to get idea, how much I can --. Because I have really short time :). Commented Aug 22, 2012 at 12:42
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    Also, you can profile your code with the expected array size and a stub algorithm before implementing the core and profile it to see what the real difference is expected to be. (Assuming the array is indeed the expected main space consumer) Commented Aug 22, 2012 at 12:42
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    I'm concerned that there may be more in terms of requirements at hand here than we (as readers) know about. That is, why is it essential that such a large 2D array be declared? Aren't there other implementations, eg sparse arrays, etc that inherently wouldn't take as much mem? As far as "large" files go, define "large?" Random access files could, theoretically, be arbitrarily large, with the underlying file sys, then hardware, affecting performance as much as anything. Very broadly, interpreted Java bytecode would likely include a performance penalty over compiled C++...Lots of variables here. Commented Aug 22, 2012 at 12:45
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    One more thing. There is another issue when allocating small objects in C++ in arrays vs java. In C++, you allocate an array of objects - and they are contiguous in the memory, while in java - the objects themselves aren't. In some cases, it might cause the C++ to have much better performance, because it is much more cache efficient then the java program. I once addressed this issue in this thread Commented Aug 22, 2012 at 12:47