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