Hello all (again),

My problem here is that I'm trying to build a list of ArrayLists that
hold data and I want to add the newly derived data into a table where
it's dependent on the first row.  A short version of my program to
illustrate what I mean:

import java.util.*;
  public class MyProg2 {
     public static void main(String[] args) {
        List table  = new ArrayList ();
        List <Integer> data = new ArrayList <Integer>();
        data.add(1);
        data.add(3);
        data.add(4);
        table.add(data);

        System.out.println ("table(0) = " + table.get(0));

        ArrayList <Integer> newNode = new ArrayList <Integer>();
        newNode = createNode((ArrayList)table.get(0),0);
        table.add(newNode);
        System.out.println ("Added in a new row and table is now:");
        System.out.println ("table(0) = " + table.get(0));
        System.out.println ("table(1) = " + table.get(1));

      }  //end main driver
      public static ArrayList createNode(ArrayList items,int lParen){
         int a = 0; int b=0; int c=0;
         if (items.size() >= 2){
           a = Integer.valueOf(items.get(lParen).toString());
           b = Integer.valueOf(items.get(rParen).toString());
           c = a + b;
           items.remove(lParen);
           items.remove(lParen);
           items.add(lParen,c);
        }
        return items;
     }
}

(I'm unable to get rid of all the unchecked msgs because putting the
<Integer> tag sometimes made the program uncompilable.  Use --nowarn
when you compile this program.  :)

Iin this code, row 0 of table is changed in the method while it
creates row 1, but I don't understand why and don't know how to keep
it from changing.   From this behavior, it's leading me to believe
ArrayLists are passed by value or is this the way of ArrayLists?  I
thought parameters were passed by reference?  What am I missing here?

-t