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