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