public String getUserName() {
        return this.userName;
    }
<p>
The user name of the user credential that has permission to access the root share D$ of the Amazon FSx file
system. The user account must belong to the Amazon FSx delegated admin user group.
</p>

@return The user name of the user credential that has permission to access the root share D$ of the Amazon FSx
        file system. The user account must belong to the Amazon FSx delegated admin user group.
aws-java-sdk-storagegateway/src/main/java/com/amazonaws/services/storagegateway/model/AssociateFileSystemRequest.java