Java Thread Synchronised with message

public class Lab2 {

    public static void main(String[] args) {
        Runnable joes = new SharingAResource("Eat at Joe's", 10, 2);
        Runnable bills = new SharingAResource("Eat at Bill's", 10, 4);
        Thread j = new Thread(joes);
        Thread b = new Thread(bills);

        j.start();
        b.start();
        System.out.println("Billboard started");

        try {

            j.join();
            b.join();
        } catch (InterruptedException e) {
            return;
        }

        System.out.println("Billboard closed");



    }



}


class SharingAResource implements Runnable {

    private String message;
    private int counter;
    private int pause;
    private static Object screen = new Object();

    //constructor

    public SharingAResource(String message, int counter, int pause){
        this.message = message;
        this.counter = counter;
        this.pause = pause * 1000;
    }

    public void run() {
        synchronized(screen) {
            System.out.println("Entered the sync block, no other thread can use this resource");
            for(int i=0; i<counter; i++) {
                try {
                    Thread.sleep(this.pause);
                } catch(InterruptedException e) {
                    return;
                }

                System.out.println(this.message);
            }
            System.out.println("Exited the sync block, other thread can now use this resource");
        }

    }
}