Display.getCurrent, testing for display item type?

To save myself quite a few lines of code, I would like to test for the type returned by display.GetCurrent and set a variable to that.
For isntance:
thisDisplayItem = display.getCurrent();
Will this work? Or will I have to know ahead of time what it will return in order to cast it?

Sorry to waste everyones time. I just realized it's a simple matter of instanceof comparison.
:P

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Display.getCurrent, testing for display item type?

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