JFrame.setExtendedState doesn't actually maximise

Question

public static void main(String args[]){
    JFrame frame = new JFrame();
    frame.setExtendedState(JFrame.MAXIMISED_BOTH);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}

I've used this code to maximise a JFrame, but instead of actually maximising the frame, it just sets the window size to that of the screen, without actually changing the state, so clicking the maximize button doesn't actually downscale it again.

Am I using the wrong command or something?

Answer 1

You have an error in frame.setExtendedState(JFrame.MAXIMISED_BOTH);

You should write frame.setExtendedState(JFrame.MAXIMIZED_BOTH); instead

Answer 2

This worked for me:

We need to combine the setSize () and setExtendedState together JFrame frame=new JFrame();

frame.setExtendedState(JFrame.MAXIMIZED_BOTH); // aligns itself with windows task bar
// set maximum screen   
frame.setSize((int)Toolkit.getDefaultToolkit().getScreenSize().getWidth(), (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight());