Question

I am trying to join int[] (array of int) using Google Guava’s Joiner class.

Example:

int[] array = { 1, 2, 3 };
String s = Joiner.on(", ").join(array);  // not allowed

I checked StackOverflow and Google. There is no “one-liner” in foundation classes to convert int[] to Integer[] or List<Integer>. It always requires a for loop, or your own hand-rolled helper function.

Any advice?

Answer 1

Ints is a Guava library containing helper functions.

Given int[] array = { 1, 2, 3 } you can use the following:

String s = Joiner.on(", ").join(Ints.asList(array));

Or more succinctly:

String s = Ints.join(", ", array);