@ThreadSafe
    class Taxi {
        @GuardedBy("this") private Point location, destination;
        private final Dispatcher dispatcher;

        public Taxi(Dispatcher dispatcher) {
            this.dispatcher = dispatcher;
        }

        public synchronized Point getLocation() {
            return location;
        }

        public synchronized void setLocation(Point location) {
            boolean reachedDestination;
            synchronized (this) {
                this.location = location;
                reachedDestination = location.equals(destination);
            }
            if (reachedDestination)
                dispatcher.notifyAvailable(this);
        }

        public synchronized Point getDestination() {
            return destination;
        }

        public synchronized void setDestination(Point destination) {
            this.destination = destination;
        }
    }

   public void setLocation(Point location) {
            boolean reachedDestination;
            synchronized (this) {
                this.location = location;
                reachedDestination = location.equals(destination);
            }
            if (reachedDestination)
                dispatcher.notifyAvailable(this);
        }

this.location = location;

public void setLocation(Point location) {
            boolean reachedDestination;
            this.location = location;
            synchronized (this) {
                 reachedDestination = location.equals(destination);
            }
            if (reachedDestination)
                dispatcher.notifyAvailable(this);
     }

public void setLocation(Point location) {
            boolean reachedDestination;
            this.location = location;
            Destination d = destination;          
            if (location.equals(d))
                dispatcher.notifyAvailable(this);
     }