code: public static <T> void addAll(Collection<T> aFrom, Collection<T> aTo)
  	{
  		if (aFrom == null || aTo == null)
  			return; // do nothing
  
  		T object = null;
  		for (Iterator<T> i = aFrom.iterator(); i.hasNext();)
  		{
  			object = i.next();
  			if (object != null)
  			{
  				aTo.add(object);
  			}
  		}
  	}
docs: All object to a given collection
  
  @param <T>
  the type class
  @param aFrom
  the collection to add from
  @param aTo
  the collection to add to.