public class Main {
    public static void main(String[] args) throws InterruptedException {
        Watek watek[] = new Watek[5];

        for(int i = 0; i < 5; i++) {
            watek[i] = new Watek();
        }

        for(int i = 4; i >= 0; i--) {
            watek[i].start();
            watek[i].join();

        }
    }
}

public class Watek extends Thread {


    public void run() {
        for(int i = 0; i < 10; i++) {
            System.out.println(super.getName() + ": bla bla bla");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}