How to make JFrame full screen

Full screen in jframe

// Getting fullscreen **effect** by extending the frame either direction.
frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
frame.setUndecorated(true);

Source: stackoverflow.com

Jframe full screen

frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
frame.setUndecorated(true);
frame.setVisible(true);

Source: stackoverflow.com

Set jframe fullscreen

GraphicsEnvironment graphics = 
		GraphicsEnvironment.getLocalGraphicsEnvironment();
        
GraphicsDevice device = graphics.getDefaultScreenDevice();
JFrame frame = new JFrame("Fullscreen");
device.setFullScreenWindow(frame);

How to make JFrame full screen

If you have extended the class to JFrame then -
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
IF not then - 
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);

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