public class Test{
    private static boolean ready;
    private static int number;
    
    private static class ReaderThread extends Thread
    {
        public void run()
        {
            while(!ready)
            {
                Thread.yield();
            }
            System.out.println(number);
        }
    }
    /**
     * @param args
     * @throws InterruptedException 
     */
    public static void main(String[] args) throws InterruptedException {
        // TODO Auto-generated method stub
        new ReaderThread().start();
        Thread.sleep(1000);
        number = 42;
        ready = true;
    }

}