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Editorial Team
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Asked: 2026-06-15T03:13:59+00:00

Given the following code GraphicsDevice screen = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0]; if (screen.isFullScreenSupported()) { //is it always

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Given the following code

 GraphicsDevice screen = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0];
 if (screen.isFullScreenSupported()) {
      //is it always true for monitors?
 }

Is screen.isFullScreenSupported() always true for monitors?

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1 Answer

  1. Editorial Team

    No, it may not be true.

    The SecurityManager might disallow you the full screen control. Mainly because one could easily fake whole screen in order to grab a password from not-suspecting user (you could mock a bank website).

    It can be false:

    • in an applet
    • in a WebStart Application
    • while running in headless mode

    JavaDOC of GraphicsDevice.isFullScreenSupported:

    Returns true if this GraphicsDevice supports full-screen exclusive
    mode. If a SecurityManager is installed, its checkPermission method
    will be called with AWTPermission(“fullScreenExclusive”).
    isFullScreenSupported returns true only if that permission is granted

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