public void setNextToken(String nextToken) {
        this.nextToken = nextToken;
    }
<p>
An identifier that was returned from the previous call to this operation, which you can use to return the next
set of items in the list.
</p>

@param nextToken
       An identifier that was returned from the previous call to this operation, which you can use to return the
       next set of items in the list.
aws-java-sdk-appsync/src/main/java/com/amazonaws/services/appsync/model/ListApiKeysRequest.java