private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vpcaccess.v1.Connector.Subnet,
            com.google.cloud.vpcaccess.v1.Connector.Subnet.Builder,
            com.google.cloud.vpcaccess.v1.Connector.SubnetOrBuilder>
        getSubnetFieldBuilder() {
      if (subnetBuilder_ == null) {
        subnetBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vpcaccess.v1.Connector.Subnet,
                com.google.cloud.vpcaccess.v1.Connector.Subnet.Builder,
                com.google.cloud.vpcaccess.v1.Connector.SubnetOrBuilder>(
                getSubnet(), getParentForChildren(), isClean());
        subnet_ = null;
      }
      return subnetBuilder_;
    }
<pre>
The subnet in which to house the VPC Access Connector.
</pre>

<code>.google.cloud.vpcaccess.v1.Connector.Subnet subnet = 8;</code>
java-vpcaccess/proto-google-cloud-vpcaccess-v1/src/main/java/com/google/cloud/vpcaccess/v1/Connector.java