class Count {
    private int count = 0;
    public synchronized void inc() {
        String s = Thread.currentThread().getName();
        int y=count; System.out.println(s+" read "+y);
        count=y+1;   System.out.println(s+" wrote "+count);
    }
} // end of class Count
public class IncSync implements Runnable {
    private static Count x = new Count();
    public void run() { x.inc(); }
    public static void main(String[] args) {
        (new Thread(new IncSync())).start();
        (new Thread(new IncSync())).start();
        (new Thread(new IncSync())).start();
    }
} // end of class IncSync