IT210 Unit 3

You need to write a program for the instructions given below:

Create a class named Billing that includes four overloaded computeBill() methods for a photo book store.

• When computeBill() receives a single parameter, it represents the price of one photo book ordered. Add 8.5% tax, and return the total due.
• When computeBill() receives two parameters, they represent the price of a photo book and the quantity ordered. Multiply the two values, add 8.5% tax and return the total due.
• When computeBill() receives three parameters, they represent the price of a photo book, the quantity ordered, and a coupon value. Multiply the quantity and price, reduce the result by the coupon value, and then add 8.5% tax and return the total due.
• When computeBill () receives four parameters, they represent the price of a photo book, the quantity ordered, a coupon value, and a weekly discount. Multiply the quantity and price, reduce the result by the coupon value plus the weekly discount, and then add 8.5% tax and return the total due.

Write a main () method that tests all three overloaded methods. Save the application as Billing.java.

Discussion

The basic structure of a Java program is captured in the relationship between a class and an object. Discuss the following questions:

• What are the design concepts and assumptions behind a class, an object and the relationship between them? What are the roles methods and static fields play in OOP?
• What is the role of constructors in OOP and why is constructor overloading important? Please give specific real-world examples to support your arguments.