Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four information as instance variables: a part number (type String), a part description (type String), a quantity of the item being purchased (type int) and a price per item (double). Your class should have a constructor that initializes the four instance variables. Provide a set and a get method for each instance variable. In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a tester class named InvoiceTest that demonstrates class Invoice’s capabilities by creating two invoices then changing and printing their characteristics.
Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four information as instance variables: a part number (type String), a part description (type String), a quantity of the item being purchased (type int) and a price per item (double). Your class should have a constructor that initializes the four instance variables. Provide a set and a get method for each instance variable. In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a tester class named InvoiceTest that demonstrates class Invoice’s capabilities by creating two invoices then changing and printing their characteristics.
Programming Logic & Design Comprehensive
9th Edition
ISBN:9781337669405
Author:FARRELL
Publisher:FARRELL
Chapter11: More Object-oriented Programming Concepts
Section: Chapter Questions
Problem 1GZ
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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:
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Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store.
- An Invoice should include four information as instance variables: a part number (type String), a part description (type String), a quantity of the item being purchased (type int) and a price per item (double).
- Your class should have a constructor that initializes the four instance variables. Provide a set and a get method for each instance variable.
- In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0.
- Write a tester class named InvoiceTest that demonstrates class Invoice’s capabilities by creating two invoices then changing and printing their characteristics.
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