public final ListVoicesResponse listVoices(ListVoicesRequest request) {
    return listVoicesCallable().call(request);
  }
Returns a list of Voice supported for synthesis.

<p>Sample code:

<pre>{@code
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (TextToSpeechClient textToSpeechClient = TextToSpeechClient.create()) {
  ListVoicesRequest request =
      ListVoicesRequest.newBuilder().setLanguageCode("languageCode-2092349083").build();
  ListVoicesResponse response = textToSpeechClient.listVoices(request);
}
}</pre>

@param request The request object containing all of the parameters for the API call.
@throws com.google.api.gax.rpc.ApiException if the remote call fails
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechClient.java