手机号中间4位做隐藏

    /**
     * 处理手机号
     * @param cell
     * @return String
     */
    public static String hideCell(String cell) {
        if (cell != null && cell.length() == 11) {
            cell = cell.substring(0,3) + "****" + cell.substring(7,11);
        }
        return cell;
    }