public com.google.protobuf.ProtocolStringList getTargetLanguageCodesList() {
    return targetLanguageCodes_;
  }
<pre>
Required. The BCP-47 language code to use for translation of the input
document. Specify up to 10 language codes here.
</pre>

<code>repeated string target_language_codes = 3 [(.google.api.field_behavior) = REQUIRED];
</code>

@return A list containing the targetLanguageCodes.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/BatchTranslateDocumentRequest.java