java: How to convert String array to Long array

String[] numbersString = {"1", "2", "3"};

List list = new ArrayList();

for (int i = 0; i <>

{

    Long tmp = Long.valueOf(s[i]);

    list.add(tmp); 

}    

//convert Long ArrayList to Long[] array 

Long[] numbersLong = (Long[])list.toArray(new Long[0]);