public java.util.List<String> getSubnetIds() {
        if (subnetIds == null) {
            subnetIds = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return subnetIds;
    }
<p>
The identifiers of the subnets for the directory servers. The two subnets must be in different Availability
Zones. Directory Service creates a directory server and a DNS server in each of these subnets.
</p>

@return The identifiers of the subnets for the directory servers. The two subnets must be in different
        Availability Zones. Directory Service creates a directory server and a DNS server in each of these
        subnets.
aws-java-sdk-directory/src/main/java/com/amazonaws/services/directory/model/DirectoryVpcSettings.java