north.requestFocus();
    public SwingTest(String title) {        super(title);        getRootPane().setDoubleBuffered(false);        setLocation(100, 100);        setSize(400, 400);        getContentPane().add(north = new JButton("JButton north"), BorderLayout.NORTH);        getContentPane().add(new JTextArea("JTextArea test"), BorderLayout.CENTER);        getContentPane().add(south = new JButton("JButton south"), BorderLayout.SOUTH);    }