the following program on synchronization is not working?

the following program on synchronization is not working?

class Callme { void call(String msg) { System.out.print("[" + msg); try {
Thread.sleep(1000); } catch (InterruptedException e) {
System.out.println("Interrupted"); } System.out.println("]"); } }
// File Name : Caller.java class Caller implements Runnable {
String msg; Callme target; Thread t; public Caller(Callme targ, String s)
{ target = targ; msg = s; t = new Thread(this); t.start(); } //
synchronize calls to call() public void run() { synchronized(target) { //
synchronized block target.call(msg); } } } // File Name : Synch.java
public class synch { public static void main(String args[]) { Callme
target = new Callme(); Caller ob1 = new Caller(target, "Hello"); Caller
ob2 = new Caller(target, "Synchronized"); Caller ob3 = new Caller(target,
"World");
// wait for threads to end
try {
ob1.t.join();
ob2.t.join();
ob3.t.join();
} catch(InterruptedException e) {
System.out.println("Interrupted");
} } }