class Demo extends Thread{

    @Override

    public void run() {

        super.run();

        for(int i=0;i<20;i++)

            System.out.println(Thread.currentThread()+"...."+i);

    }

}

public class ThreadDemo1 {

    public static void main(String[] args){

        Demo d1 = new Demo();

        Demo d2 = new Demo();

        d1.start();

        d2.start();

    }

}

class Demo2 implements Runnable{

    public void run() {

        for(int i=0;i<20;i++)

            System.out.println(Thread.currentThread()+"..."+i);

    }

}

public class ThreadDemo2 {

    public static void main(String[] args) {

        Thread t1 = new Thread(new Demo2());

        Thread t2 = new Thread(new Demo2());

        t1.start();

        t2.start();

    }

}