Hi,

Am 22.12.2010 um 11:15 schrieb Mark Engelberg:

> Are there any examples available of creating a compiled
> class/interface with deftype and defprotocol, and using these from
> Java?

Protocols also define an interface which can be implemented by classes. For 
deftype this happens when you specify the methods inline in the deftype 
definition. Then you can call the method directly on the object as you would do 
with any other java method. However this does not work for types which use 
extend to extend the protocol to the type. Here you still have to go through 
the protocol functions.

An example should look like this:

(ns some.name.space)

(defprotocol SomeProtocol
  (foo [this]))

(deftype SomeType
  [a b]
  SomeProtocol
  (foo [this] (str a b)))

Then in Java:

import some.name.space.SomeType;
…
SomeType st = new SomeType("some a", "and a b");
…
st.foo();

Not tested, though.

Sincerely
Meikel

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