How to give each store object it's own arrayList of stock?

Question

Finding this one tough, basically I have three classes: Store class, Stock class and then the class for the GUI. When a store is created, I want it to have it\'s very own arrary

Answer 1

In the constructor of Store, you have

ArrayList <Stock> stockItems = ...

That is actually creating a local variable stockItems, instead of changing the field. To make it work use just

stockItems = ...