I don't believe there are any examples of a specifically JRPG kind of inventory.
However, there is David's example which I have never actually looked into. So I cannot say if it's close to the style you're aiming for or not.
Then there's scidave's tutorial Mikey's Adventure, which i believe does feature a list kind of inventory.
There's also a simple example I made for a western-style RPG inventory:
Looking through these examples might help you to find an own approach. I'd say such a thing would definitely involve an array, to create the columns and the rows of the item list and a hash table which has the items stored with their quantity as the key value. So much for the very rough theory.
If you need further help keep asking.