How to initialise an array in Java with a constant value efficiently

Question

Is there a way to initialise an array of integers (or possibly any array) to a constant value other than zero (or null) which are the defaults, without a for loop?

Ideally I am looking for a function like "ones" in matlab, which is not only neater but also more efficient.

Answer 1

Arrays.fill() is the method you're after. (Although internally it still uses a for loop, so unlike System.arrayCopy(), it isn't any faster.)

P.s.: Arrays, and its collection-based counterpart Collections are two extremely useful classes in general.