Create a class named Purchase. Each Purchase contains an invoice number (private int), amount of sale (private double), and amount of sales tax (private double). Include set methods for the invoice number and sale amount. Within the set() method for the sale amount, calculate the sales tax as 5% of the sale amount. Also include a display method that displays a purchase’s details (i.e invoice, sale amount and tax). Save the file as Purchase.java. 2. Create an application (with main ()) that declares a Purchase object (using class defined in previous question) and prompts the user if he/she wants to enter an invoice number (1-yes, 0 – no). If user enters 1 then the program will prompt for an invoice number, do not let the user proceed until a number between 1,000 and 8,000 has been entered. Next, the program prompts for a sale amount, do not proceed until the user has entered a nonnegative value. Using the values entered by the user create a Purchase object, display the object’s invoice number, sale amount, and sales tax using the display() defined in the Purchase class (in question a) as shown below. Next, the program should ask user if he or she wants to enter another invoice. If user enter 1 then follow the process discussed again until the user enters 0. Save the file as CreatePurchase.java.
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
- Create a class named Purchase. Each Purchase contains an invoice number (private int), amount of sale (private double), and amount of sales tax (private double). Include set methods for the invoice number and sale amount. Within the set() method for the sale amount, calculate the sales tax as 5% of the sale amount. Also include a display method that displays a purchase’s details (i.e invoice, sale amount and tax). Save the file as Purchase.java.
2. Create an application (with main ()) that declares a Purchase object (using class defined in previous question) and prompts the user if he/she wants to enter an invoice number (1-yes, 0 – no). If user enters 1 then the program will prompt for an invoice number, do not let the user proceed until a number between 1,000 and 8,000 has been entered. Next, the program prompts for a sale amount, do not proceed until the user has entered a nonnegative value. Using the values entered by the user create a Purchase object, display the object’s invoice number, sale amount, and sales tax using the display() defined in the Purchase class (in question a) as shown below. Next, the program should ask user if he or she wants to enter another invoice. If user enter 1 then follow the process discussed again until the user enters 0. Save the file as CreatePurchase.java.
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