public void sortLinkedList2() {
		long start = System.currentTimeMillis();
		Object[] arr= ll.toArray();
		Arrays.sort(arr);
		ll.clear();
		LinkedList<Object> newLL = new LinkedList<>();
		for (int i = 0; i < arr.length; i++) {
			newLL.add(arr[i]);
		}
		
		long end = System.currentTimeMillis();
		System.out.println("using time: " + (end - start));
	}