How can I see in Java if an Object is an array without using reflection? And how can I iterate through all items without using reflection?

I use Google GWT so I am not allowed to use reflection :(

I would love to implement the following methods without using refelection:

private boolean isArray(final Object obj) { ??.. }

private String toString(final Object arrayObject) { ??.. }

BTW: neither do I want to use Javascript such that I can use it in non-GWT environments

Ed