the add method takes 1 parameter (well, there are versions that take ore than one, but none that takes two strings....)
What you need to do is break up the adding of things into the list into two separate commands:
Also, I would just declare the exits to be a List; this hids that fact that it is an array list and lets you replace it with any type of list later one (like a LinkedList). Not that that is likely to happen here, but it is a good habit to get into.
Piscis Babelis est parvus, flavus, et hiridicus, et est probabiliter insolitissima raritas in toto mundo.