How to convert List<Integer> to Integer[] in java?

Question

I was trying to convert an ArrayList of Integer to Integer[]

Integer[] finalResult = (Integer[]) result.toArray();

but I got an exception

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer;

Help me out please.

Answer 1

You need to use the version of toArray() that accepts a generic argument:

Integer[] finalResult = new Integer[result.size()];
result.toArray(finalResult);

or, as a one-liner:

Integer[] finalResult = result.toArray(new Integer[result.size()]);