How to cast from List to double[] in Java?

Question

I have a variable like that:

List frameList =  new ArrayList();

/* Double elements has added to frameList */

H

Answer 1

Guava has a method to do this for you: double[] Doubles.toArray(Collection)

This isn't necessarily going to be any faster than just looping through the Collection and adding each Double object to the array, but it's a lot less for you to write.