query results into new ArrayList or not?

[nimo frey]

What is better (performance or the like):

Case 1 (putting the result into a new ArrayList):

List<User> users= new ArrayList<User>(entityManager.createNamedQuery(..));

or Case 2 (setting the result without creating a new ArrayList):

List<User> users= (List<User>) entityManager.createNamedQuery(..);

[Mark Spritzler]

Why would you want to create a whole new instance if you don't have to.

Running the query, if it calls the resultList() method, it automatically returns a List that is an actual implementation of a List, most likely ArrayList. And you should always be coding to an interface anyway.

Hope that helps.

Mark

[nimo frey]

okay,

so there is no need to create a new ArrayList-Instance.

thanks.