ArrayList shallow copy iterate or clone()

Question

I need a shallow copy of an java ArrayList, should I use clone() or iterate over original list and copy elements in to new arrayList, which is fast

Answer 1

the question says shallowcopy not deepcopy.Copying directly reference from one arraylist reference to another will also work right.Deep copy includes copy individual element in arraylist.

ArrayList list=new ArrayList();
list.add(3);
ArrayList list1=list; //shallow copy...

Is there any problem in this ??