Java Arrays.asList on primitive array type produces unexpected List type [duplicate]

Question

Possible Duplicate:
Arrays.asList() not working as it should?

Apparently the return type of Arrays.asList(new int[] { 1, 2, 3 }); is List<int[]>. This seems totally broken to me. Does this have something to do with Java not autoboxing arrays of primitive types?

Millard

int is not an Object, but int[] is. – Decline

Answer 1

The problem is that Arrays.asList takes a parameter of T... array. The only applicable T when you pass the int[] is int[], as arrays of primitives will not be autoboxed to arrays of the corresponding object type (in this case Integer[]).

So you can do Arrays.asList(new Integer[] {1, 2, 3});.

Amador

Or simply Arrays.asList(1,2,3); – Freakish

Answer 2

Try:

Arrays.asList(new Integer[] { 1, 2, 3 });

Note Integer instead of int. Collections can contain only objects. No primitive types are allowed. int is not an object, but int[] is, so this is why you get list with one element.

Droplet