static class Renderer extends JPanel implements TableCellRenderer {
        public Renderer() {
            super();
            setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
        }

        public Component getTableCellRendererComponent(JTable table,
                Object value, boolean isSelected, boolean hasFocus, int row,
                                                                int column) {
            if (value == null)
                return null;
            JLabel label = new JLabel(value.toString());
            label.setAlignmentX(Component.CENTER_ALIGNMENT);
            add(label);
            if (isSelected) {
                setBackground(table.getSelectionBackground());
                setForeground(table.getSelectionForeground());
            } else {
                setBackground(table.getBackground());
                setForeground(table.getForeground());
            }
            return this;
        }
    }