public Region withRelationalDatabaseAvailabilityZones(AvailabilityZone... relationalDatabaseAvailabilityZones) {
        if (this.relationalDatabaseAvailabilityZones == null) {
            setRelationalDatabaseAvailabilityZones(new java.util.ArrayList<AvailabilityZone>(relationalDatabaseAvailabilityZones.length));
        }
        for (AvailabilityZone ele : relationalDatabaseAvailabilityZones) {
            this.relationalDatabaseAvailabilityZones.add(ele);
        }
        return this;
    }
<p>
The Availability Zones for databases. Follows the format <code>us-east-2a</code> (case-sensitive).
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setRelationalDatabaseAvailabilityZones(java.util.Collection)} or
{@link #withRelationalDatabaseAvailabilityZones(java.util.Collection)} if you want to override the existing
values.
</p>

@param relationalDatabaseAvailabilityZones
       The Availability Zones for databases. Follows the format <code>us-east-2a</code> (case-sensitive).
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lightsail/src/main/java/com/amazonaws/services/lightsail/model/Region.java