php - How to use class on primary menu ul instead of div in wordpress -

i used php coding in wordpress primary menu.

<?php    wp_nav_menu( array(     'menu' => 'top menu',     'theme_location' => 'primary',     'depth' => 2,     'menu_class' => 'nav navbar-nav',   ));  ?> 

this output in preview.

<div class="nav navbar-nav">   <ul>     <li class="active"><a href="#"> news  <span class="sr-only">(current)</span></a></li>     <li><a href="#">funny pictures</a></li>     <li><a href="#">funny videos</a></li>     <li><a href="#">goverment jobs</a></li>     <li><a href="#">health</a></li>     <li><a href="#">best shoping deal</a></li>   </ul> </div> 

this should work below, not above. please explain change need made in php code.

<div>   <ul class="nav navbar-nav">     <li class="active"><a href="#"> news  <span class="sr-only">(current)</span></a></li>     <li><a href="#">test</a></li>   </ul> </div> 

look @ wordpress documentation states things need .

<?php  $defaults = array(     'theme_location'  => '',     'menu'            => '',     'container'       => 'div',     'container_class' => '',     'container_id'    => '',     'menu_class'      => 'menu',     'menu_id'         => '',     'echo'            => true,     'fallback_cb'     => 'wp_page_menu',     'before'          => '',     'after'           => '',     'link_before'     => '',     'link_after'      => '',     'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',     'depth'           => 0,     'walker'          => '' );  wp_nav_menu( $defaults );  ?> 

i didn't understand question have understood may use container class add class div folder , menu_class add class name ul element .