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

You can use the ArrayUtils class from commons-lang to obtain a double[] from a Double[].

Double[] ds = frameList.toArray(new Double[frameList.size()]);
...
double[] d = ArrayUtils.toPrimitive(ds);