问题
I'am wrapping a java lib into clojure, but i have problems dealing with variable length arguments. Say,
TestClass.aStaticFunction(Integer... intList){/*....*/}
How could i call this function in clojure?
回答1:
Since Java varargs are actually arrays, you can call vararg functions in Clojure by passing an array.
You could convert a Clojure seq (maybe by using Clojure's variety of variable argument functions) into an array:
(TestClass/aStaticFunction (into-array Integer [(int 1),(int 2)]))
or
(defn a-static-function-wrapper [& args]
(TestClass/aStaticFunction (into-array Integer args))
Or make an array and set its indices manually
(TestClass/aStaticFunction (doto (make-array Integer 3)
(aset 0 first-element)
(aset 1 second-element)
(aset 2 third-element)))
回答2:
Java variable length arguments actually want an array as input.
So in Clojure the call should be something like:
(TestClass/aStaticFunction (into-array Integer some-sequence-of-integers))
回答3:
(TestClass/aStaticFunction (to-array '(1 2 3 4 5)))
For e.g.
(java.util.Arrays/asList (to-array '(1 2 3 4 5)))
来源:https://stackoverflow.com/questions/11702184/how-to-handle-java-variable-length-arguments-in-clojure