public Boolean put(Object key,Object value){
  try {
    hash.updateObject(key,value);
    notifyObservers();
    return true;
  }
 catch (  Exception e) {
    e.printStackTrace();
    return false;
  }
}

public Boolean put ( Object key , Object value ) { try { hash . updateObject ( key , value ) ; notifyObservers ( ) ; return true ; } catch ( Exception e ) { e . printStackTrace ( ) ; return false ; } }
store a key / value pair
