listcellrenderer problem

class Main extends DefaultListCellRenderer {

    private static final long serialVersionUID = 1L;

    public Component getListCellRendererComponent(final JList list,
            Object value,
            final int index,
            boolean isSelected,
            boolean cellHasFocus) {
        setText(value.toString());
        class M extends MouseAdapter {
            public void mouseEntered(MouseEvent e) {
                Point p = new Point(e.getX(), e.getY());
                list.setSelectedIndex(list.locationToIndex(p)); 
                if (index == list.locationToIndex(p)) {
                    setBackground(Color.red);
                }
            }
        }
        list.addMouseListener(new M());
        return this;
    }

    public static void main(String[] args) {
        JFrame fr = new JFrame("JList");
        JList list = new JList(new Object[]{"a", "b", "c", "d"});
        list.setCellRenderer(new Main());
        fr.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        fr.add(list);
        fr.setSize(300, 300);
        fr.setVisible(true);
    }
}
 

 class MyCellRenderer extends JLabel implements ListCellRenderer {
	private static final long serialVersionUID = 1L;
	private JList list        = null;
	private int cellIndex     = -1;
	private boolean exited    = false;
	private Color activeColor = Color.RED;
	private Color hideColor   = Color.GREEN;
	
	@Override
	public Component getListCellRendererComponent(JList list, 
											      Object value,
											      int index, 
											      boolean isSelected,
											      boolean cellHasFocus) {
		this.list = list;
		
//		Album album = (Album)value;
		setText(value);
		
//		setIcon(new ImageIcon(album.image));
		
		if(index == cellIndex)                setBackground(activeColor);
		else if(index != cellIndex || exited) setBackground(hideColor);

		setOpaque(true);
		return this;
	}	
	class mouseMovedEvent extends MouseAdapter {

		@Override
		public void mouseMoved(MouseEvent e) {
			exited = false;
			cellIndex = list.locationToIndex(e.getPoint());
			list.repaint();
		}
	}
	class mouseExitedEvent extends MouseAdapter {

		@Override
		public void mouseExited(MouseEvent e) {
			exited = true;
			cellIndex = -1;
			list.repaint();
		}
	}
}