public java.lang.String getNextPageToken() {
      java.lang.Object ref = nextPageToken_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        nextPageToken_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
A token to retrieve next page of results.

To return the next page of results, call
[ListQueues][google.cloud.tasks.v2beta3.CloudTasks.ListQueues] with this
value as the
[page_token][google.cloud.tasks.v2beta3.ListQueuesRequest.page_token].

If the next_page_token is empty, there are no more results.

The page token is valid for only 2 hours.
</pre>

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

@return The nextPageToken.
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/ListQueuesResponse.java