[legerdemain]

It's mostly a novelty today. Felleisen is a programming language theorist, and him writing a little Java tutorial sounds absurd.

The book itself takes you on a journey to reinvent the Visitor pattern, in a version of Java that predates generics. You can probably find a better explainer for the Visitor pattern in Java.

[bainsfather]

Thanks. I see it for sale for £4 second hand, so maybe I should buy it for the novelty value alone. I presume I shouldn't try to refresh my java from it though.