e601. enabling full-screen mode.txt

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In full-screen mode, no window can overlap the full-screen window. Also, when in full-screen mode, the display mode typically can be changed if desired (see e605 Setting the Screen Size, Refresh Rate, or Number of Colors). 
    // Determine if full-screen mode is supported directly
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gs = ge.getDefaultScreenDevice();
    if (gs.isFullScreenSupported()) {
        // Full-screen mode is supported
    } else {
        // Full-screen mode will be simulated
    }
    
    // Create a button that leaves full-screen mode
    Button btn = new Button("OK");
    btn.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent evt) {
            // Return to normal windowed mode
            GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            gs.setFullScreenWindow(null);
        }
    });
    
    // Create a window for full-screen mode; add a button to leave full-screen mode
    Frame frame = new Frame(gs.getDefaultConfiguration());
    Window win = new Window(frame);
    win.add(btn, BorderLayout.CENTER);
    
    try {
        // Enter full-screen mode
        gs.setFullScreenWindow(win);
        win.validate();
    
        // ...
    } finally {
        // Exit full-screen mode
        gs.setFullScreenWindow(null);
    }

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