public void actionPerformed(ActionEvent e)
    {


      if(placementLimit < 5){

       //placementlimit is limit to buttons clicked

        JButton clickedButton = (JButton)e.getSource();

        clickedButton.setBackground(Color.RED);
        /* something like: int pos =  clickedButton.getGridPos
         *  arrayplacedpositions.add(pos);
        */
        placementLimit++;
   }