This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
List is an interface implemented by ArrayList. ArrayList is a List.
Therefore, you can pass an ArrayList as the argument. List<Integer> list = new ArrayList<Integer>() ; // compiles.
I hope this can help answer your question.