Hi all,
I know that Vector is synchronized,
when I run the following program

public class ClassA extends Thread{
static Vector<Integer > v=new Vector<Integer>();
public void run()

    public   void callMethod() {
    public static void main(String[] args) {
         for(int i=0;i<1000;i++)
            ClassA a=new ClassA();


When I run the above program i am expecting result as 0 1..0 1... 0 1.. because vector internally sychronized ,
but when i give sychronize in externally its working fine

i.e when i change method as public static synchronized void callMethod() { then its working fine

So vector sychnronization where it works
could any one help me
thanks in advance

Vectors own methods are synchronised on the Vector instance, so if you call add on a Vector from one thread while another thread is executing a remove yhou should be OK.
Vetor knows nothing about your callMethod method, so it can do nothing about synchronising that. It does not / cannot know that you want the calls on lines 9 and 11 to be synchronised as one block.