public String getNextKeyMarker() {
        return nextKeyMarker;
    }
Gets the key marker to use in
the next <code>listVersions</code> request in order to obtain the next page of results.
Returns <code>null</code> if the version listing is not truncated.
For truncated requests,
this value is equal to the greatest (lexicographically) value of the
object keys included in this listing.

@return The key marker to use in
        the next <code>listVersions</code> request in order to obtain the next page of results.
        Returns <code>null</code> if the version listing is not truncated.

@see VersionListing#isTruncated()
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/VersionListing.java