public java.util.List<String> getVpcIds() {
        return vpcIds;
    }
<p>
The unique identifiers of the VPCs that you want Network Firewall to retrieve the firewalls for. Leave this blank
to retrieve all firewalls that you have defined.
</p>

@return The unique identifiers of the VPCs that you want Network Firewall to retrieve the firewalls for. Leave
        this blank to retrieve all firewalls that you have defined.
aws-java-sdk-networkfirewall/src/main/java/com/amazonaws/services/networkfirewall/model/ListFirewallsRequest.java