If i use a Collections.synchronizedList () i still need to synchronize that list.

[RaviNada Kiran]

If i use a Collections.synchronizedList () i still need to synchronize that list.

List list = Collections.synchronizedList(new ArrayList());
synchronized(list) {
      Iterator i = list.iterator(); // Must be in synchronized block
      while (i.hasNext())
          foo(i.next());
  } 

Then what is the use of using this method Collections.synchronizedList ()

Please suggest your ideas.

[Rob Spoor]

For a synchronizedList return value, all individual methods are synchronized. So you can make a single call to add, remove or get and be sure that that add / removal / retrieval is executed atomically. However, it does not make compound statements atomic. Adding two elements after each other is still not an atomic operation, and neither is iterating over it.