code: public String[] toWordArray()
      {
          List<Word> wordList = toSimpleWordList();
          String[] wordArray = new String[wordList.size()];
          Iterator<Word> iterator = wordList.iterator();
          for (int i = 0; i < wordArray.length; i++)
          {
              wordArray[i] = iterator.next().value;
          }
          return wordArray;
      }
docs: 获取所有单词构成的数组
  
  @return