How to handle java variable length arguments in clojure?

Question

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?

possible duplicate of Implement a Java interface method with a variable number of args in Clojure — Jeremy
– Jeremy, Commented Jul 28, 2012 at 15:41

Zach L · Accepted Answer · 2012-07-28 15:28:16Z

66

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)))

answered Jul 28, 2012 at 15:28

Zach L

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mikera · Accepted Answer · 2012-07-28 15:28:35Z

9

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))

answered Jul 28, 2012 at 15:28

mikera

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jittakal · Accepted Answer · 2012-07-28 15:39:06Z

5

(TestClass/aStaticFunction (to-array '(1 2 3 4 5)))

For e.g.

(java.util.Arrays/asList (to-array '(1 2 3 4 5)))

answered Jul 28, 2012 at 15:39

jittakal

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