code: public OrderableDBInstanceOption withAvailabilityZones(AvailabilityZone... availabilityZones) {
          if (this.availabilityZones == null) {
              setAvailabilityZones(new com.amazonaws.internal.SdkInternalList<AvailabilityZone>(availabilityZones.length));
          }
          for (AvailabilityZone ele : availabilityZones) {
              this.availabilityZones.add(ele);
          }
          return this;
      }
docs: <p>
  A list of Availability Zones for a DB instance.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setAvailabilityZones(java.util.Collection)} or {@link #withAvailabilityZones(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param availabilityZones
  A list of Availability Zones for a DB instance.
  @return Returns a reference to this object so that method calls can be chained together.