Array Lists

If I declare 2 Array Lists, and add the second one to the first, how can I access the second one through the first. This probably dont make any sense to anybody so I'll also try it this way...

PHP Code:

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void Function()
{
     ArrayList List1 = new ArrayList();
     ArrayList List2 = new ArrayList();
     for (int x = 0; x < 10; x++)
          List2.Add(x); // Fill the List with integers
        
     List1.Add(List2); // Add List2 to List1
     
     // Now, say I want to access the 2nd item in List2 through List1...
     int y = (int)List1[0][1]; // <-- Wont compile

     // However, I can create a temporary array list and get it that way.
     ArrayList tmpList = new ArrayList();
     tmpList = (ArrayList)List1[0]; // List1[0] is List2

     // Now I can access the individual items
     int y = (int)tmpList[0];
} 


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Do you see what I'm trying to do?

I'm trying to access elements of List2 by going through List1. I dont want to create a temporary ArrayList and copy to it... that seems like a waste of resources.

Either:

this line:

Code:

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int y = (int)List1[0][1];

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becomes this:

Code:

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int y = (int)((ArrayList)List1[0])[1];

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or these lines:

Code:

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ArrayList tmpList = new ArrayList();
tmpList = (ArrayList)List1[0];

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become this:

Code:

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ArrayList tmpList = (ArrayList)List1[0];

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Yes, as jmcilhinney demonstrated you need to cast the item back to an ArrayList because it stores generic objects.

Thanks guys... Just what I needed! :)