public String getNextToken() {
        return this.nextToken;
    }
<p>
When the number of shards in the data stream is greater than the default value for the <code>MaxResults</code>
parameter, or if you explicitly specify a value for <code>MaxResults</code> that is less than the number of
shards in the data stream, the response includes a pagination token named <code>NextToken</code>. You can specify
this <code>NextToken</code> value in a subsequent call to <code>ListShards</code> to list the next set of shards.
For more information about the use of this pagination token when calling the <code>ListShards</code> operation,
see <a>ListShardsInput$NextToken</a>.
</p>
<important>
<p>
Tokens expire after 300 seconds. When you obtain a value for <code>NextToken</code> in the response to a call to
<code>ListShards</code>, you have 300 seconds to use that value. If you specify an expired token in a call to
<code>ListShards</code>, you get <code>ExpiredNextTokenException</code>.
</p>
</important>

@return When the number of shards in the data stream is greater than the default value for the
        <code>MaxResults</code> parameter, or if you explicitly specify a value for <code>MaxResults</code> that
        is less than the number of shards in the data stream, the response includes a pagination token named
        <code>NextToken</code>. You can specify this <code>NextToken</code> value in a subsequent call to
        <code>ListShards</code> to list the next set of shards. For more information about the use of this
        pagination token when calling the <code>ListShards</code> operation, see
        <a>ListShardsInput$NextToken</a>.</p> <important>
        <p>
        Tokens expire after 300 seconds. When you obtain a value for <code>NextToken</code> in the response to a
        call to <code>ListShards</code>, you have 300 seconds to use that value. If you specify an expired token
        in a call to <code>ListShards</code>, you get <code>ExpiredNextTokenException</code>.
        </p>
aws-java-sdk-kinesis/src/main/java/com/amazonaws/services/kinesis/model/ListShardsResult.java