Centrare una finestra Java

Snippet facile facile:

    public static void centerFrame(Window frame) {
        Dimension frameSize = frame.getSize();
        frame.setSize(frameSize);
        frame.setLocation(
            (Toolkit.getDefaultToolkit().getScreenSize().width
                - frameSize.width) / 2,
            (Toolkit.getDefaultToolkit().getScreenSize().height
                - frameSize.height) / 2);
    }