public Builder setNextPageToken(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      nextPageToken_ = value;
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Token to retrieve the next page of results, or empty if there are no more
results in the list.
</pre>

<code>string next_page_token = 2;</code>

@param value The nextPageToken to set.
@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ListProductSetsResponse.java