public Integer getIpv6AddressCount() {
        return this.ipv6AddressCount;
    }
<p>
The number of IPv6 addresses to associate with the primary network interface. Amazon EC2 chooses the IPv6
addresses from the range of your subnet. You cannot specify this option and the option to assign specific IPv6
addresses in the same request. You can specify this option if you've specified a minimum number of instances to
launch.
</p>
<p>
You cannot specify this option and the network interfaces option in the same request.
</p>

@return The number of IPv6 addresses to associate with the primary network interface. Amazon EC2 chooses the IPv6
        addresses from the range of your subnet. You cannot specify this option and the option to assign specific
        IPv6 addresses in the same request. You can specify this option if you've specified a minimum number of
        instances to launch.</p>
        <p>
        You cannot specify this option and the network interfaces option in the same request.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/RunInstancesRequest.java