Should I call dispose on MWArray after I call getField in Java?

I am using Java to call matlab. I figured out when I create a MWArray, I need to call dispose explicitly. Then I have this situation:

In the program I call a matlab method many times, every time it returns a MWStructArray m, then I call MWArray mw= m.getField(index) on the MWStructArray m, and print out mw. I will call dispose on m, My question is do I need call mw.dispose also?

A similar question is: I call a matlab method, it return a MWStructArray or MWCellArray m, this object is long live, i will keep it in the memory. But I will call MWArray mw= m.getField(index) many times, is safe to call mw.dispose() every time? will it destroy the data in m? Keep in mind, I want to reuse m again.

Is there any document on exactly how MCR keep/free the object.

Thanks

[Yong]

by looking the source code of MWStructArray.

   public Object get(String paramString, int paramInt)
   {
     MWArray localMWArray = null;
     try
     {
       localMWArray = getField(paramString, paramInt);
       return localMWArray != null ? localMWArray.toArray() : null;
     }
    finally
    {
      if (localMWArray != null)
         localMWArray.dispose();
     }
   }

It seems I should call dispose, and it is safe to do so.