public String getNextMarker() {
        return nextMarker;
    }
Gets the marker to use in the next <code>listObjects</code>
request in order to see
the next page of results. 
If an object listing is not truncated, this
method will return <code>null</code>. For
truncated requests, this value is equal to the greatest
lexicographical value of the object keys and common prefixes included
in this listing.

@return The marker to use in the next <code>listObjects</code> request in order to see
        the next page of results if this object listing is truncated.
        Returns <code>null</code> if this object listing isn't truncated.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/ObjectListing.java