Sometimes we want to invoke Java methods from our Clojure code. If the Java method accepts variable arguments (varargs) parameter and we want to invoke the method from Clojure, we must pass an array as an argument. To create an array in Clojure we can use several functions. The to-array function will transform a collection to an Object[] type. For primitive type arrays we can use for example int-array to get a int[] array. The function into-array is the most flexible function. This function accepts a sequence argument and optionally the class type of the resulting array. Once we have the array we can use it as an argument value for the varargs parameter of the Java method we want to invoke.

In the following example, we use into-array, to-array and short-array to invoke a Java method with varargs parameter and see how we can build different array types:

Source: DZone