Clojure映射rename-keys

(ns clojure.examples.example
   (:require [clojure.set :as set])
   (:gen-class))
(defn example []
   (def demokeys (hash-map z 1 b 2 a 3))
   (def demonew (set/rename-keys demokeys {z newz b newb a newa}))
   (println demonew))
(example)