public class Inc implements Runnable {
    private static int x = 0;
    private static void pause(int t) {
        try {
            Thread.sleep((int) (Math.random()*t*1000));
        } catch (InterruptedException e) {
            System.err.println(e.toString());
        }
    }
    public void run() {
        String s = Thread.currentThread().getName();
        pause(3); int y = x;
        System.out.println(s+ " read "+y);
        pause(4); x = y+1;
        System.out.println(s+ " wrote "+(y+1));
    }
    public static void main(String[] args) {
        (new Thread(new Inc())).start();
        pause(2);
        (new Thread(new Inc())).start();
        pause(2);
        (new Thread(new Inc())).start();
    }
} // end of class Inc