public java.lang.String getSourceLanguageCode() {
        java.lang.Object ref = sourceLanguageCode_;
        if (!(ref instanceof java.lang.String)) {
          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          sourceLanguageCode_ = s;
          return s;
        } else {
          return (java.lang.String) ref;
        }
      }
<pre>
Source language code.
</pre>

<code>string source_language_code = 2;</code>

@return The sourceLanguageCode.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/AdaptiveMtTranslateRequest.java