java-collection: How to copy the content of one ArrayList to another one?

Yes you can easily do it by the following way :

1. Create the object of the ArrayList<String> by calling the constructor in which a list is passes as a parameter as following -

List<T> newList = new ArrayList<T>(oldList);

2. By cloning the object -
newList = (ArrayList<T>)oldList.clone();

and now you can clear the oldList for further use as follows :
oldList.clear();