How to make ArrayList synchronized ?

ArrayList methods are non-synchronized but still if there is a need that we can make them synchronized as :

//Use Collecions.synzhonizedList method

List l = Collections.synchronizedList(new ArrayList());

...

//If you want to use iterator on the synchronized list, use it

//like this. It should be in synchronized block.

synchronized (l) {

  Iterator it = l.iterator();

  while (it.hasNext())

      ...

      it.next();

      ...

}