public class MyThread extends Thread {
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i = 0; i < 30; i++) {
            System.out.println(Thread.currentThread().getName()+":i="+i);
        }
    }
    public static void main(String[] args) {
        new MyThread().start();
        new MyThread().start();
    }
}