public String getPrefix() {
        return prefix;
    }
The prefix parameter originally used to request this version listing, or
<code>null</code> if no prefix was specified. All object keys included in this version
listing start with the specified prefix.

@return The prefix parameter originally used to request this version
        listing, or <code>null</code> if no prefix was specified.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/VersionListing.java