@Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   ExtJwnlSensedWord other = (ExtJwnlSensedWord) obj;
   if (wordObj == null) {
     if (other.wordObj != null) return false;
   } else if (!wordObj.equals(other.wordObj)) return false;
   return true;
 }