Highlight Listener

class HighlightListener extends MouseAdapter{

        private Cell[] highlighted = new Cell[c.getSize()];

        public void mouseClicked(MouseEvent e){

            Cell cell = new Cell();
            cell = (Cell) e.getSource();

            if(cell.getAcross() != null && !cell.isHighlight()){
                if(highlighted[0] != null){
                    for(Cell c : highlighted){
                        c.setHighlight(false);
                    }
                }

                Clue clue = cell.getAcross();
                highlighted = clue.getCellsInRange().clone();
                for(Cell c : highlighted){
                    c.setHighlight(true);
                }

            } else {
                if(cell.getDown() != null){
                    if(highlighted[0] != null){
                        for(Cell c : highlighted){
                            c.setHighlight(false);
                        }
                    }
                    Clue clue = cell.getDown();
                    highlighted = clue.getCellsInRange().clone();
                    for(Cell c : highlighted){
                        c.setHighlight(true);
                    }

                }
            }
            repaint();
        }
    }