public String getMarker() {
        return marker;
    }
Gets the marker parameter originally used to request this object listing, or
<code>null</code> if no marker was specified. 
If specified, all objects and common
prefixes included in this object listing will occur
alphabetically after the specified marker.

@return The marker parameter originally used to request this object
        listing. Returns <code>null</code> if no marker was specified.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/ObjectListing.java