class MyRunnable implements Runnable {
    public void run() {
        System.out.println("Runnable!");
    }
}

public class MyThread extends Thread {
    public MyThread() {
        super();
    }

    public MyThread(Runnable target) {
        super(target);
    }

    public void run() {
        System.out.println("Thread!");
    }

    public static void main(String[] args) {
        new MyThread().start();
        new MyThread(new MyRunnable()).start();
    }
}