public Builder setEtag(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      etag_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
This checksum is computed by the server based on the value of other
fields. This may be sent on update, undelete, and delete requests to ensure
the client has an up-to-date value before proceeding.
</pre>

<code>string etag = 3;</code>

@param value The etag to set.
@return This builder for chaining.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/DeleteCustomClassRequest.java