Why can't save uri object while building a uri?

Question

The first snippet won't append the 'locationQuery' paramenter, but the second one will, why the difference?

First snippet:

Uri builtUri = Uri.parse(FORECAST_BASE_URL);
builtUri.buildUpon()
        .appendQueryParameter(QUERY_PARAM, locationQuery)
        .build();

Second snippet (From udacity course github ):

Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon()
                  .appendQueryParameter(QUERY_PARAM, locationQuery)
                  .build();

Answer 1

Because you are not assigning Uri created with below expression

builtUri.buildUpon()
        .appendQueryParameter(QUERY_PARAM, locationQuery)
        .build();

Change it to

builtUri = builtUri.buildUpon()
        .appendQueryParameter(QUERY_PARAM, locationQuery)
        .build();