public class CdkJavaStack extends Stack {
    public CdkJavaStack(final Construct scope, final String id) {
        this(scope, id, null);
    }

    public CdkJavaStack(final Construct scope, final String id, final StackProps props) {
        super(scope, id, props);

        CfnVPC vpc = CfnVPC.Builder
            .create(this, "MyVpc")
            .enableDnsHostnames(true)
            .enableDnsSupport(true)
            .instanceTenancy("default")
            .build();

        List<CfnSubnet> subnets = new ArrayList<>();
        CfnSubnet subnet = new CfnSubnet(this,
            "PublicSubnets",
            CfnSubnetProps.builder()
                    .vpcId(vpc.getRef())
                    .mapPublicIpOnLaunch(false)
                    .tags(List.of(CfnTag.builder().key("MyKey").value("MyValue").build()))
                    .build());

        subnets.add(subnet);

        System.out.println(subnets.get(0).getTags().tagValues());
        String natGatewayName = subnets.get(0).getTags().tagValues().get("MyKey") + "-NatGateway";
        CfnNatGateway natGateway = CfnNatGateway.Builder
            .create(this, natGatewayName)
            .subnetId(subnets.get(0).getRef())
            .tags(List.of(CfnTag.builder().key("MyKey").value(natGatewayName).build()))
            .build();
    }
}