How can i define multiple constructors and states using gen-class in clojure? I do not see a way to do this with single valued mappings for :init, :state and :constructors.
Multiple Constructors
To have multiple constructors on the generated class you need all the constructor parameters specified in the :constructors option of gen-class, and the :init function should be multi-arity to match. Something like the following:
(ns something-amazing
(:gen-class :init myconstructor
:state state
:constructors {[String] []
[String String] []}))
(defn -myconstructor
([^String p1] [[] {:name p1 :special false}])
([^String p1 ^String p2] [[] {:name p1 :special p2}]))
In this case, both constructors would call the same zero-parameter super-type constructor, as specified by the empty vector values in the :constructor hash-map.
Multiple States
State is generally a hash-map, so you don't need multiple states. Just use keywords where you would use field names in an object.
{:name "name1"
:special false}
(defn -method1 [this] (:name (.state this)))