Creating an ArrayList from an existing LinkedList si done using the following constructor.
Java Code:
ArrayList(Collection c)
Constructs a list containing the elements of the specified collection, 
in the order they are returned by the collection's iterator.
Following is an example:
Java Code:
     		 LinkedList ll = new LinkedList();
     		 ll.add("ll1");
     		 ll.addFirst("ll2");
     		 ll.addLast("ll3");
     		 ArrayList arrayList= new ArrayList(ll);