Java

Program To Create Invoice Of Items Sold In A Store

By 2 Mins Read
The program below is the answer to Deitel’s Java How to Program (9th Edition) Chapter 3 Exercise 3.13.

Question: 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 pieces of 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 test application named InvoiceTest that demonstrates class Invoice’s capabilities.

To run the application save both files with the same name as the class (because it is a public class) and with the .java file extension (in this case Ex03_13.java and Ex03_13_Test.java). Then compile both classes and run Ex03_13_Test. Ex03_13 will not run because it does not have a main method.

To compile both classes at the same time using the command prompt, use the command

javac Ex03_13.java Ex03_13_Test.java

To run Ex03_13_Test, use the command

java Ex03_13_Test

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/**<br /> *<br /> * @Author: Aghatise Osazuwa<br /> * Website: www.cscprogrammingtutorials.com<br /> *<br /> * Exercise 3.13 - Invoice Class<br /> * This Program Creates An Invoice For An Item Sold At The Store<br /> *<br /> */ <br /><br /> public class Ex03_13 {<br />    <br />    private String partNumber;<br />    private String partDescription;<br />    private int quantityOfItemPurchased;<br />    private double pricePerItem;<br />    <br />    public Ex03_13 (String number, String description, int quantity, double price) {<br />        partNumber = number;<br />        partDescription = description;<br />        quantityOfItemPurchased = quantity;<br />        pricePerItem = price;<br />    }<br />    <br />    public void setPartNumber (String number) {<br />        partNumber = number;<br />    }<br />    <br />    public String getPartNumber () {<br />        return partNumber;<br />    }<br />    <br />    public void setPartDescription (String description) {<br />        partDescription = description;<br />    }<br />    <br />    public String getPartDescription () {<br />        return partDescription;<br />    }<br />    <br />    public void setQuantityOfItemPurchased (int quantity) {<br />        quantityOfItemPurchased = quantity;<br />    }<br />    <br />    public int getQuantityOfItemPurchased () {<br />        return quantityOfItemPurchased;<br />    }<br />    <br />    public void setPricePerItem (double price) {<br />        pricePerItem = price;<br />    }<br />    <br />    public double getPricePerItem () {<br />        return pricePerItem;<br />    }<br />    <br />    public double getInvoiceAmount () {<br />        double calculateTotalAmount;<br />        calculateTotalAmount = quantityOfItemPurchased * pricePerItem;<br />        return calculateTotalAmount;<br />    }<br />    <br /> }<br />

Below is Class Ex03_13_Test.java to test Class Ex03_13.java

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//Exercise 3.13 - Invoice Class Test<br />//This Program Demonstrates Class Ex03_13 (Invoice Class) Capabilities<br /><br />import java.util.Scanner;<br /><br />public class Ex03_13_Test {<br />    public static void main (String [] args) {<br /><br /> Ex03_13 invoice = new Ex03_13 (" ", " ", 0, 0.0);<br /><br /> Scanner input = new Scanner (System.in);<br />        <br />        String item;<br />        String description;<br />        int quantity;<br />        double price;<br />        <br />        System.out.print ("Enter Number: ");<br />        item = input.nextLine();<br />        invoice.setPartNumber(item);<br />        <br />        System.out.print ("Enter Description of Item Purchased: ");<br />        description = input.nextLine();<br />        invoice.setPartDescription(description);<br />        <br />        System.out.print ("Enter The Quantity of Item Purchased: ");<br />        quantity = input.nextInt();<br /> if (quantity &gt; 0)<br />        invoice.setQuantityOfItemPurchased(quantity);<br />        <br />        System.out.print ("Enter The Price Per Item: ");<br />        price = input.nextDouble();<br /> if (price &gt; 0)<br />        invoice.setPricePerItem (price);<br />        <br />        System.out.printf ("The Total Amount for all items purchased = $%.2fn",<br />                invoice.getInvoiceAmount());<br /><br />    }<br />}<br />

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