public Builder addHcxActivationKeys(com.google.cloud.vmwareengine.v1.HcxActivationKey value) {
      if (hcxActivationKeysBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureHcxActivationKeysIsMutable();
        hcxActivationKeys_.add(value);
        onChanged();
      } else {
        hcxActivationKeysBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
List of HCX activation keys.
</pre>

<code>repeated .google.cloud.vmwareengine.v1.HcxActivationKey hcx_activation_keys = 1;</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/ListHcxActivationKeysResponse.java