public class Mojwatek implements Runnable {
        @Override
    public void run() {
        try {
            Thread.sleep(10000);
        } catch (InterruptedException ex) {
            System.out.println(ex.toString());
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        }
    }
}


---------------------------------------------

public class Main {

    public static void main(String[] args) {
        Mojwatek w1 = new Mojwatek();
        int x=0;
        while (true)
        {
            Thread temp = new Thread(w1);
            temp.start();
            x++;
            System.out.println(x);
        }
    }
}