Java : autoboxing of an Object array of integers, cast to int from LinkedList.toArray()

Question

I would like to use code similar to the following:

int letterIndex[];
LinkedList<Integer> letterList;

...

if(!letterList.isEmpty()) letterIndex = (Integer[])letterList.toArray();

However, it is not allowed, and apparently the cast to Integer[] is not autoboxed when converting to int[]. How would I accomplish the equivalent without declaring letterIndex as Integer[] instead of int[]?

Answer 1

You'd have to create a new array and assign each value from the Integer[] array.

Apache commons-lang has ArrayUtils.toPrimitive(wrapperArray).

Answer 2

Why are you using primitives?

Can you change it to:

Integer[] letterIndex;