code: public DescribeNatGatewaysResult withNatGateways(NatGateway... natGateways) {
          if (this.natGateways == null) {
              setNatGateways(new com.amazonaws.internal.SdkInternalList<NatGateway>(natGateways.length));
          }
          for (NatGateway ele : natGateways) {
              this.natGateways.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the NAT gateways.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setNatGateways(java.util.Collection)} or {@link #withNatGateways(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param natGateways
  Information about the NAT gateways.
  @return Returns a reference to this object so that method calls can be chained together.