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Editorial Team
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Asked: 2026-05-23T03:22:59+00:00

I have two screens plugged into my computer and was wondering if there was

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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:

java.awt.Toolkit.getDefaultToolkit().getScreenSize();

Which gets my screen size of my main screen, but how can I get the size of my second screen, or detect which screen the window is on?

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1 Answer

  1. Editorial Team

    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.)

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