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Hm...

Then I would try using the casting as you had suggested earlier. This wouldn't run into any problems, so long as you don't run into any all-digit strings (such as "693" or "212"); these...

Okay. In that case, I'd use two ArrayLists, one of Strings and another of Integers (the Integer class I mean; ints won't work).

...Okay, I'm a little more confused now. That casting idea is a good one; however, you would need a way to check if something was originally an int (I'd use try and catch with Integer.parseInt())....

@mwebb

Here's a specific question for you:

Do the Strings and ints that you are working with come in pairs, or are you instead working with data which contains mingled Strings and ints?

If...

I'm still confused; even after re-reading this. But I can offer this:

1) ArrayLists -- and all other Collections, for that matter -- don't work with primitive types. Since they require a class...