Output letter with KeyListener in Java?

I want to display the pressed letter in a window using drawString. Unfortunately, I don't know how to display the information from e.getKeyChar() using drawString.
Here is the Java code:

 public class Test extends JPanel implements KeyListener {    String a;    Random r = new Random();    int x = r.nextInt(6) + 1;    int y = r.nextInt(6) + 1;    Test() {        addKeyListener(this);        setFocusable(true);        requestFocusInWindow();    }    @Override    public void keyPressed(KeyEvent e) {        a = e.getKeyChar();        repaint();    }    public void paint(Graphics g) {        super.paint(g);        g.setColor(Color.blue);        g.drawString(a, x, y);    }    @Override    public void keyTyped(KeyEvent e) {}    @Override    public void keyReleased(KeyEvent e) {}    public static void main(String[] args) {        JFrame m = new JFrame("Letters");        Test neu = new Test();        m.setContentPane(neu);        m.setVisible(true);        m.setSize(400, 400);        m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    } }