public boolean addTokens(Collection<? extends Object> tokens){
  boolean added=false;
  for (  Object token : tokens) {
    add(token.toString());
    added=true;
  }
  return added;
}

public boolean addTokens ( Collection < ? extends Object > tokens ) { boolean added = false ; for ( Object token : tokens ) { add ( token . toString ( ) ) ; added = true ; } return added ; }
add a collection of tokens to the list , applying tostring to each .
