ArrayList initializing

ArrayList initializing

Hey guys I just have a quick question about initializing an arraylist
This is just a small piece of code I'm doing
public class OrderManager {
ArrayList<Order>orders = new ArrayList<Order>();
public OrderManager() {
}
public OrderManager(ArrayList<Order> orders) {
orders = new ArrayList<Order>();
}
using a variable orders, and then declaring orders = new correct? Or is
this going to be two different instances and when I try to add things to
it its not going to work?
Or since OrderManager is going to take an arraylist does it even make sense?
I haven't tested it yet, I just started writing this code and have ran
into this problem before where I couldn't add to the list properly and
believe it was because of a error similar to this just checking to try and
get it right to start with.