How to make an ArrayList Synchronized

By default ArrayList is not synchronized and Vector is Synchronized.
But we can also make an ArrayList synchronized using the following code.
But if want to iterate that list then we have to iterate that list within the synchronized block.

		List<String> list = new ArrayList<String>();
		// Use the following collections method to make an ArrayList synchronized
                synchronized (list) {
			Iterator<String> iterator = list.iterator();
			while (iterator.hasNext()) {
				String string = (String);