@java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }
<pre>
Optional. Checksum used to ensure that the user-provided value is up to
date before the server processes the request. The server compares provided
checksum with the current checksum of the resource. If the user-provided
value is out of date, this request returns an `ABORTED` error.
</pre>

<code>string etag = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for etag.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/DeleteVmwareEngineNetworkRequest.java