public class Main implements Runnable {
    volatile int i;
    public void run() {
	for (i = 0; i < 100; i++) {
	    System.out.println(i);
	}
    }

    public static void main(String[] args) {
        Main a = new Main();
        Thread t1 = new Thread(a);
        Thread t2 = new Thread(a);
        t1.start();
        t2.start();
    }        
}