[racket] Typed Racket and classes and objects

I've started going through "A Little Java a Few Patterns"  to learn
some basic OOP techniques and patterns but I've been using Racket
instead of Java (I don't know Java so I'd prefer to stick with
Racket).  Is it possible to use Typed Racket instead of Racket with
classes and objects, so I can put types on the class arguments and
values the methods return, similar to what the Java based examples do?

Thanks,
Harry Spier