$1.$ The flow starts from Restaurant

$2.$ When a new customer comes to restaurant, customer object is created and his name is set.

$3.$ A new waiter is called to customer, waiter object is created

$4.$ The waiter comes to customer to take order, waiter.takeOrder$($customer$)$ method is called. He

will show menu, menu$()$ method is called.

$5.$ A new order is created

$6.$ Customer.orderingItems$()$ is called and the return type order is passed into order

$7.$ The waiter collects order from customer and he will place the order to the chef,

placeOrderTochef$()$ method.

$8.$ Here there will be a VegChef and NonVegChef. Both objects are created here.

$9.$ If order is veg it is sent to veg section and vegSection$($Order$)$ method is called.

$10.$ If order is Non veg it is sent to non veg section and nonVegSection$($Order$)$ method is called.

$11.$ From any of them prepareOrder$($order$)$ method is called which can be called from both classes.

$12.$ prepareOrder$($order$)$ internally calls callWaiter$($verRnonVeg$)$ method so that after preparing

order chef delivers the order to waiter

$13.$ After receiving order customer will start eating $,$ customer.eat$().$

$14.$ Bill object is created

$15.$ Bill is generated according to customer order, by generateBill$($Customer$)$ method.

Chef

void prepareOrder$($Order order, String vegRnonVeg$)$

void callWaiter$($String vegRnonVeg$)$

VegChef

public void vegSection$($Order order$)$

NonVegChef

public void nonVegSection$($Order order$)$