I'm using JavaFX 2. I want my frame to open maximized but I'm not seeing a way. I searched a bit on the internet without success. For the stage I see setFullScreen() and setIconified() but I don't see anything like setMaximized().
When evaluating the sourcecode of the Ensemble.jar provided with the samples of JavaFX 2.0 SDK, the currently valid way to achieve window maximizing is
Screen screen = Screen.getPrimary();
Rectangle2D bounds = screen.getVisualBounds();
primaryStage.setX(bounds.getMinX());
primaryStage.setY(bounds.getMinY());
primaryStage.setWidth(bounds.getWidth());
primaryStage.setHeight(bounds.getHeight());
(you find similar code in WindowButtons.java)
The 'maximize' button is still enabled and when clicking it, the windows will grow a bit more (Windows OS). After this the 'maximize 'button is disabled. In the provided example the standard buttons are replaced. Maybe this is still an issue.
The Java 8 implementation of the Stage class provides a maximized property, which can be set as follows:
primaryStage.setMaximized(true);
Better use Multi-Screen compatible maximize logic:
// Get current screen of the stage
ObservableList<Screen> screens = Screen.getScreensForRectangle(new Rectangle2D(stage.getX(), stage.getY(), stage.getWidth(), stage.getHeight()));
// Change stage properties
Rectangle2D bounds = screens.get(0).getVisualBounds();
stage.setX(bounds.getMinX());
stage.setY(bounds.getMinY());
stage.setWidth(bounds.getWidth());
stage.setHeight(bounds.getHeight());
try this simpler code
primaryStage.setMaximized(true);
and it fills up the whole screen
. note that if you remove maximize/minise buttons the application will fill the whole screen as well as remove the taskbar so mnd your initStyles if you have any
Use this to remove the Minimise, Maximise Buttons :
primaryStage.initStyle(StageStyle.UTILITY);
Where primaryStage is your Stage object.
来源：https://stackoverflow.com/questions/6864540/how-to-set-a-javafx-stage-frame-to-maximized