private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.workstations.v1.WorkstationConfig,
            com.google.cloud.workstations.v1.WorkstationConfig.Builder,
            com.google.cloud.workstations.v1.WorkstationConfigOrBuilder>
        getWorkstationConfigFieldBuilder() {
      if (workstationConfigBuilder_ == null) {
        workstationConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.workstations.v1.WorkstationConfig,
                com.google.cloud.workstations.v1.WorkstationConfig.Builder,
                com.google.cloud.workstations.v1.WorkstationConfigOrBuilder>(
                getWorkstationConfig(), getParentForChildren(), isClean());
        workstationConfig_ = null;
      }
      return workstationConfigBuilder_;
    }
<pre>
Required. Config to update.
</pre>

<code>
.google.cloud.workstations.v1.WorkstationConfig workstation_config = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/UpdateWorkstationConfigRequest.java