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I think I've seen it happen, so maybe there is. I might even (unbeknownst to me) have the power to do it myself, though I tend to be better at theory than implementation. :D

Your loop-of-loops...

That's a different problem, so I'd say you should have a new thread. Why aren't you using BigInteger for your problem?

strLine = br.readLine()
You're reading Strings from the file. If you want to store / manipulate numbers, you should be converting each String you read from your input to a number. If the numbers are...

The only sure way is to use Object.hashCode(), but perhaps you're not asking the right question.

It depends on what the Object is. If the Object is a java.lang.Integer, then there's a handy method...