A petrol (gas) station is to be set up for fully automated operation. A driver inputs his or her credit card into the pump, the card is verified by communication with a credit company computer and a fuel limit established. The driver may then take the fuel required and, on completion of delivery (when the pump hose is returned to its holster), the driver's credit account is debited with the cost of the fuel taken. The credit card is returned after debiting. If the card is invalid, it is returned by the pump with no fuel dispensed

Explanation:

Gas Filling Station has pumps. Pumps have credit card readers. Driver can able to swipe their cards, pumps have Fuel. Pumps card readers communicate with Credit Company. Driver interacts with pump for fuel and credit card.

In this situation the following we need to treat as objects.

They are Pump, Card reader, Fuel tank, communication system, system controller and price table.

Design pattern for the following system is attached below

a variable of array type holds a reference of object

array are commonly used in computer program to organize data so that a related set of values

array are using zero base indexing it start with 0.

all component of array have same type, two different types doesn't use in single array

if array are store 10 quantities its index value varies from 0 to 9.

it stores 1st quantity value in index value 0 and this process will same till index value 9.