I have two screens plugged into my computer and was wondering if there was a way in JFrame or Toolkit of detecting which screen the window is on?
I have this code:>
You should take a look at GraphicsEnvironment.
In particular, getScreenDevices():
Returns an array of all of the screen GraphicsDevice objects.
You can get the dimensions from those GraphicDevice objects (indirectly, via getDisplayMode). (That page also shows how to put a frame on a specific device.)
And you can get from a JFrame to its device via the getGraphicsConfigration() method, which returns a GraphicsConfiguration that has a getDevice(). (The getIDstring() method will probably enable you to differentiate between the screens.)