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