private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.CustomClass,
            com.google.cloud.speech.v2.CustomClass.Builder,
            com.google.cloud.speech.v2.CustomClassOrBuilder>
        getCustomClassFieldBuilder() {
      if (customClassBuilder_ == null) {
        customClassBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.CustomClass,
                com.google.cloud.speech.v2.CustomClass.Builder,
                com.google.cloud.speech.v2.CustomClassOrBuilder>(
                getCustomClass(), getParentForChildren(), isClean());
        customClass_ = null;
      }
      return customClassBuilder_;
    }
<pre>
Required. The CustomClass to create.
</pre>

<code>
.google.cloud.speech.v2.CustomClass custom_class = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/CreateCustomClassRequest.java