The code above provides an example of an interface class. Explain the purpose and advantages of creating interfaces that store related constants.

What will be an ideal response?

The purpose for creating an interface containing constants is to provide a set of data that a number of classes can use without having to redeclare the values. This interface provides a number of constants for a pizzeria. Any class written for the pizzeria can implement this interface and use the permanent values. The PizzaDemo application shows an example that uses each value. The application only needs a declaration for the current special price. All the constants, such as the name of the pizzeria, are retrieved from the interface.