public void setPrivateIpAddress(String privateIpAddress) {
        this.privateIpAddress = privateIpAddress;
    }
<p>
The primary private IPv4 address of the network interface. If you don't specify an IPv4 address, Amazon EC2
selects one for you from the subnet's IPv4 CIDR range. If you specify an IP address, you cannot indicate any IP
addresses specified in <code>privateIpAddresses</code> as primary (only one IP address can be designated as
primary).
</p>

@param privateIpAddress
       The primary private IPv4 address of the network interface. If you don't specify an IPv4 address, Amazon
       EC2 selects one for you from the subnet's IPv4 CIDR range. If you specify an IP address, you cannot
       indicate any IP addresses specified in <code>privateIpAddresses</code> as primary (only one IP address can
       be designated as primary).
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/CreateNetworkInterfaceRequest.java