code: public SpotFleetLaunchSpecification withNetworkInterfaces(InstanceNetworkInterfaceSpecification... networkInterfaces) {
          if (this.networkInterfaces == null) {
              setNetworkInterfaces(new com.amazonaws.internal.SdkInternalList<InstanceNetworkInterfaceSpecification>(networkInterfaces.length));
          }
          for (InstanceNetworkInterfaceSpecification ele : networkInterfaces) {
              this.networkInterfaces.add(ele);
          }
          return this;
      }
docs: <p>
  One or more network interfaces. If you specify a network interface, you must specify subnet IDs and security
  group IDs using the network interface.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setNetworkInterfaces(java.util.Collection)} or {@link #withNetworkInterfaces(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param networkInterfaces
  One or more network interfaces. If you specify a network interface, you must specify subnet IDs and
  security group IDs using the network interface.
  @return Returns a reference to this object so that method calls can be chained together.