suggestion for java design pattern

i'm starting using design pattern in java .now i'm writing a java code that pass all this tests :

@Test
    public void createOrder() {
        final Restaurant restaurant = new Restaurant();
        final int tableId = restaurant.initTable(4);
        restaurant.customerSays(tableId, "Joe: Soup");
        restaurant.customerSays(tableId, "Jim: Same");
        restaurant.customerSays(tableId, "Jack: Chips");
        restaurant.customerSays(tableId, "John: Chips");
        assertEquals("Soup, Soup, Chips, Chips",
                restaurant.createOrder(tableId));
    }

    @Test
    public void failedCreationBecauseNotEveryoneOrdered() {
        final Restaurant restaurant = new Restaurant();
        final int tableId = restaurant.initTable(4);
        restaurant.customerSays(tableId, "Joe: Soup");
        restaurant.customerSays(tableId, "Joe: Spaghetti");
        restaurant.customerSays(tableId, "Jim: Roastbeef");
        assertEquals("MISSING 2", restaurant.createOrder(tableId));
        restaurant.customerSays(tableId, "Jack: Spaghetti");
        restaurant.customerSays(tableId, "John: Chips");
        assertEquals("Spaghetti, Roastbeef, Spaghetti, Chips",
                restaurant.createOrder(tableId));
    }

    @Test
    public void failedCreationBecauseNotEnoughPeopleForADishFor2() {

        final Restaurant restaurant = new Restaurant();
        final int tableId = restaurant.initTable(4);
        restaurant.customerSays(tableId, "Joe: Soup");
        restaurant.customerSays(tableId, "Jim: Same");
        restaurant.customerSays(tableId, "Joe: Fish for 2");
        restaurant.customerSays(tableId, "Jack: Chips");
        restaurant.customerSays(tableId, "John: Chips");
        assertEquals("MISSING 1 for Fish for 2",
                restaurant.createOrder(tableId));
        restaurant.customerSays(tableId, "John: Fish for 2");
        assertEquals("Fish for 2, Soup, Chips, Fish for 2",
                restaurant.createOrder(tableId));
    }

i'm starting using the Factory design pattern :

mydesign but i think its not the correct one to use ! any suggestion ?