isFullScreenSupported always true for monitors

Question

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?

Is this just a statement of fact, or do you have a question / problem? — Jim, Nov 12 '12 at 21:35
i want to start application allways in fullscreen, if all monitor support it. — user1819311, Nov 24 '12 at 13:18

Rekin · Accepted Answer · 2012-11-12T23:05:37.553

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

isFullScreenSupported always true for monitors

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