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class mythread extends Thread {    public void run() {        // TODO Auto-generated method stub        super.run();        while (true) {            try {                Thread.sleep(500);            } catch (InterruptedException e) {                // TODO: handle exception                e.printStackTrace();            }            System.out.println("extends: " + Thread.currentThread().getName());        }    }}class mythread1 implements Runnable {    public void run() {        // TODO Auto-generated method stub        while (true) {            try {                Thread.sleep(400);            } catch (InterruptedException e) {                // TODO: handle exception                e.printStackTrace();            }            System.out.println("runnable: " + Thread.currentThread().getName());        }    }}