Looping through objects and pulling values out when Objects are in arrarylist?

I have an object as you can see in the image attached. How do I loop through my list items and pull values e.g. accept_date??

Is the type of the objects stored in your ArrayList always going to be the same (i.e. SUMMER_Utils.SUMMER_Application_SURP), is going to be a couple of different types that you know, or is it going to be numerous types that you may not know?
They'll be different objects but all have common fields.
Are they deriving from a common class or implementing a common interface?