Example of using gen-class to subclass a class with multi-arity method

ByteInputStream.clj

(ns example.ByteInputStream
  (:gen-class
    :extends java.io.InputStream
    :state byteseq
    :init init
    :constructors {[clojure.lang.Seqable] []}
    :exposes-methods {read readSuper}
    :main false))

(defn -init [byte-seq]
  [[] (ref byte-seq)])

(defn -read
  ([this] (dosync
            (let [byte-seq (.byteseq this)
                  [b & more-bytes] @byte-seq]
              (ref-set byte-seq more-bytes)
              (if b b -1))))
  ([this byte-arr] (.readSuper this byte-arr))
  ([this byte-arr off len] (.readSuper this byte-arr off len)))

(comment
  (compile 'example.ByteInputStream)
  (def bis (example.ByteInputStream. [67 108 111 106 117 114 101]))
  (slurp bis)
  )