public void setNetworkCardIndex(Integer networkCardIndex) {
        this.networkCardIndex = networkCardIndex;
    }
<p>
The index of the network card. Some instance types support multiple network cards. The primary network interface
must be assigned to network card index 0. The default is network card index 0.
</p>

@param networkCardIndex
       The index of the network card. Some instance types support multiple network cards. The primary network
       interface must be assigned to network card index 0. The default is network card index 0.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/AttachNetworkInterfaceRequest.java