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You can add any Object to an ArrayList, including other ArrayLists. What have you tried?

Everything you've asked (how to resize an array, how to import an ArrayList, now this) is pretty basic. If...

Please post an SSCCE demonstrating exactly what you're doing, as it's hard to tell the problem from a single line.

If I had to guess, I would say it sounds like you're missing an import statement,...

Please use the highlight tags when posting code.

What's stopping you from using an ArrayList? They've been around since 1.2.

If you're asking how to resize an array, a general way to go about...