Collections

Question

I need help. I am taking my first class in visual basic, and the current problem we are working on requires us to modify "A Shipping Hub" application that was already created, so that the user can double click a package in a list box. When the package number is double clicked the package's information should be displayed in a MessageBox The first step says: To loop through the packages in the ArrayList of Packages, you need to create a reference of type Package. I am really unclear as to what they mean when they say create a reference of type Package. Is there anyone out there willing to help? I'm really confused. Thanks!