Mine

	public static String lClosure(State state, ArrayList<TransitionRule> alist) {
		Boolean flag = false;
		TreeSet closure = new TreeSet();
		TransitionRule check = null;
  
		for(int i = 0; i<alist.size(); i++) {
		    check = alist.get(i);
			if(check.CState.Name.equals(state.Name) && check.Input.equals("l")) {
				flag = closure.add(check.NState);
				if (flag) {
                                       lClosure(check.NState, alist);
                                }
			}
		}

	
		  return closure.toString();
		}