Change AWT Frame's maximize behaviour to fullscreen on MacOS

Question

. 。 Answers to this question are eligible for a +100 reputation bounty. tyrondis wants to to this question. 。

When creating an AWT Frame in a Java program running on MacOS, the maximize button in the frame's title bar maximises the window:

public static void main(String args[]) {
    new Frame();
}

When I create a Swing JFrame instance instead, the same button toggles the window into fullscreen mode, which is the standard behaviour on MacOS. The button even looks different visually when I hover over it:

public static void main(String args[]) {
    new JFrame();
}

Is there any way how I can replicate JFrame's "maximize to fullscreen" behaviour with AWT's Frame? I scanned the code of the entire JFrame class and wasn't able to identify any logic that would toggle the Frame's behaviour in such a way.

Answer 1

Try this code:

import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.Window;

public class MyFrame extends Frame {

    MyFrame() {
        for (Window w : Window.getWindows()) {
            GraphicsEnvironment.getLocalGraphicsEnvironment()
                    .getDefaultScreenDevice().setFullScreenWindow(w);
        }
    }

    public static void main(String args[]) {
        MyFrame f = new MyFrame();
        f.setVisible(true);
    }

}