public String getAvailabilityZone() {
        return this.availabilityZone;
    }
<p>
The EC2 Availability Zone that the DB instance is created in
</p>
<p>
Default: A random, system-chosen Availability Zone in the endpoint's Amazon Region.
</p>
<p>
Example: <code>us-east-1d</code>
</p>
<p>
Constraint: The AvailabilityZone parameter can't be specified if the MultiAZ parameter is set to
<code>true</code>. The specified Availability Zone must be in the same Amazon Region as the current endpoint.
</p>

@return The EC2 Availability Zone that the DB instance is created in</p>
        <p>
        Default: A random, system-chosen Availability Zone in the endpoint's Amazon Region.
        </p>
        <p>
        Example: <code>us-east-1d</code>
        </p>
        <p>
        Constraint: The AvailabilityZone parameter can't be specified if the MultiAZ parameter is set to
        <code>true</code>. The specified Availability Zone must be in the same Amazon Region as the current
        endpoint.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/CreateDBInstanceRequest.java