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Which part don't you know how to do? If you want help, you'll have to provide an SSCCE that demonstrates the problem. In your case, two simple classes- one containing an ArrayList, and one that needs...

When you get a compiler error saying that it cannot find the symbol, that means the variable you're trying to use is not available in the scope. Variables declared inside if statements or for loops...

Where in each class would you put it? What happened when you tried each?