public String getAvailabilityZoneName() {
        return this.availabilityZoneName;
    }
<p>
Describes the Amazon Web Services Availability Zone in which the file system is located, and is valid only for
One Zone file systems. For more information, see <a
href="https://docs.aws.amazon.com/efs/latest/ug/storage-classes.html">Using EFS storage classes</a> in the
<i>Amazon EFS User Guide</i>.
</p>

@return Describes the Amazon Web Services Availability Zone in which the file system is located, and is valid
        only for One Zone file systems. For more information, see <a
        href="https://docs.aws.amazon.com/efs/latest/ug/storage-classes.html">Using EFS storage classes</a> in
        the <i>Amazon EFS User Guide</i>.
aws-java-sdk-efs/src/main/java/com/amazonaws/services/elasticfilesystem/model/FileSystemDescription.java