AtomicIntegerFieldUpdater sample code

import java.util.concurrent.atomic.*;

class Container {
  public volatile int no;
}

class Task extends Thread {
  private AtomicIntegerFieldUpdater<Container> updater =
    AtomicIntegerFieldUpdater.newUpdater(Container.class, "no");
  private Container c;

  public Task(Container c) {
    this.c = c;
  }
  @Override
  public void run() {
    System.out.println(updater.getAndIncrement(c));  
    System.out.println(updater.getAndIncrement(c));  
  }
}

public class UpdaterUsage {
  public static void main (String [] args) {
    Container c = new Container();
    Task t1 = new Task(c);
    Task t2 = new Task(c);
    t1.start();
    t2.start();
  }  
}