我对在 Java 中使用 wordnet 查找单词的反义词很感兴趣。我目前正在使用这种方法来查找反义词，但我还没有找到任何带有反义词的单词。反义词在 Wordnet 中不常见吗？还是这个实现有缺陷？

public List<String> getantonyms(String baseWord) {
    List<String> synonymList = new ArrayList<>();
    IIndexWord[] baseWordPOS = getallPOSForBaseWord(baseWord);
    for (IIndexWord iIndexWord : baseWordPOS) {
        if (iIndexWord == null) {
            continue;
        }
        for (IWordID wordID : iIndexWord.getWordIDs()) {
            IWord word = dict.getWord(wordID);
            ISynset synset = word.getSynset();
            Map<IPointer,List<ISynsetID>> relatedMap = synset.getRelatedMap();
            for (Map.Entry<IPointer,List<ISynsetID>> entry : relatedMap.entryset()) {
                IPointer iPointer = entry.getKey();
                if (iPointer.equals(Pointer.ANTONYM)) {
                    List<ISynsetID> iSunsetIDS = entry.getvalue();
                    for (ISynsetID iSynsetID : iSunsetIDS) {
                        ISynset synset1 = dict.getSynset(iSynsetID);
                        for (IWord w : synset1.getWords()) {
                            synonymList.add(ConvertToPolyFormat(w.getLemma()));
                        }
                    }
                }
            }
        }
    }
    return synonymList.stream()
            .distinct()
            .filter(s -> !s.equals(baseWord))
            .collect(Collectors.toList());
} 

我正在用这些词进行测试：

String[] testWords = {"able","unable","adsorbent","apple","tart","computer","cat","great","allowable"};

但它们都返回空列表。我正在检查单词的所有词性 (POS)：

private static final POS[] POS_ARRAY = {POS.ADJECTIVE,POS.ADVERB,POS.NOUN,POS.VERB};

private IIndexWord[] getallPOSForBaseWord(String baseWord) {
    IIndexWord[] returnValue = new IIndexWord[4];
    for (int i = 0; i < returnValue.length; i++) {
        returnValue[i] = dict.getIndexWord(baseWord,POS_ARRAY[i]);
    }
    return returnValue;
}

我使用相同的方法来查找同义词，但检查了指针类型是否与/hypernym/etc...相关，并且在该实现中取得了成功。

其他信息：

dict 变量是来自 (edu.mit.jwi.IDictionary) 的 IDictionary 对象