public Builder setCustomClasses(
        int index, com.google.cloud.speech.v1.CustomClass.Builder builderForValue) {
      if (customClassesBuilder_ == null) {
        ensureCustomClassesIsMutable();
        customClasses_.set(index, builderForValue.build());
        onChanged();
      } else {
        customClassesBuilder_.setMessage(index, builderForValue.build());
      }
      return this;
    }
<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.v1.CustomClass custom_classes = 3;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/SpeechAdaptation.java