code: @Override
      public java.util.concurrent.Future<ListVirtualMFADevicesResult> listVirtualMFADevicesAsync(
              com.amazonaws.handlers.AsyncHandler<ListVirtualMFADevicesRequest, ListVirtualMFADevicesResult> asyncHandler) {
  
          return listVirtualMFADevicesAsync(new ListVirtualMFADevicesRequest(), asyncHandler);
      }
docs: Simplified method form for invoking the ListVirtualMFADevices operation with an AsyncHandler.
  
  @see #listVirtualMFADevicesAsync(ListVirtualMFADevicesRequest, com.amazonaws.handlers.AsyncHandler)