@java.lang.Override
  public java.util.List<? extends com.google.cloud.speech.v1p1beta1.CustomClassOrBuilder>
      getCustomClassesOrBuilderList() {
    return customClasses_;
  }
<pre>
A collection of custom classes. To specify the classes inline, leave the
class' `name` blank and fill in the rest of its fields, giving it a unique
`custom_class_id`. Refer to the inline defined class in phrase hints by its
`custom_class_id`.
</pre>

<code>repeated .google.cloud.speech.v1p1beta1.CustomClass custom_classes = 3;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/SpeechAdaptation.java