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>
The custom classes.
</pre>

<code>repeated .google.cloud.speech.v1.CustomClass custom_classes = 1;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/ListCustomClassesResponse.java