Java - Animacion objetos(Hilos)

public class Bolas extends JFrame implements MouseListener {

    private int x = 0;

    private int y = 0;

    public Bolas() {

        setSize(800, 800);

        setLocation(100, 100);

        addMouseListener(this);

        setVisible(true);

    }

    public void paint(Graphics g) {

        super.paintComponents(g);

        g.setColor(Color.yellow);

        g.fillOval(x, y, 100, 100);

    }

    public static void main(String argv[]) {

        Bolas c = new Bolas();

    }

    @Override

    public void mouseClicked(MouseEvent e) {

        x = e.getX();

        y = e.getY();

        repaint();

    }

    @Override

    public void mousePressed(MouseEvent e) {}

    @Override

    public void mouseReleased(MouseEvent e) {}

    @Override

    public void mouseEntered(MouseEvent e) {}

    @Override

    public void mouseExited(MouseEvent e) {}

}