ArrayAdapter.getPosition(item) Returns What?

I see the开发者_JS百科 documentation says this method returns the position of the given item, but what would it return if no such item exists in the ArrayAdapter?

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After looking through the source code I've found that the ArrayAdapter uses List.indexOf(Object) to find the object and this method returns -1 when it doesn't exist.

GrepCode is awesome for finding stuff when the documentation is bad, I use it at least once a day :)

Source: GrepCode