
Concept explainers
a.
Explanation of Solution
Program:
File name: “Purchase.java”
//Define a class named Purchase
public class Purchase
{
//Declare the private variables
private int invoiceNumber;
private double saleAmount;
private double tax;
private static final double RATE = 0.05;
//Define a set method for the invoice number
public void setInvoiceNumber(int num)
{
invoiceNumber = num;
}
//Define a set method for the sale amount
public void setSaleAmount(double amt)
{
//Calculate the sales tax as 5% of the sale amount
saleAmount = amt;
tax = saleAmount * RATE;
}
�...
b.
Explanation of Solution
Program:
File name: “CreatePurchase.java”
//Import necessary header files
import javax.swing.*;
//Define a class named CreatePurchase
public class CreatePurchase
{
//Define a main method
public static void main(String[] args)
{
//Declare Purchase object
Purchase purch = new Purchase();
//Declare the variables
int num;
double amount;
String entry;
final int LOW = 1000, HIGH = 8000;
//Prompt the user to enter the invoice number
entry = JOptionPane.showInputDialog(null, "Enter invoice number");
num = Integer.parseInt(entry);
/*While the user does not enter a number between 1,000 and 8,000*/
while(num <= LOW || num >= HIGH)
{
//Print the message
entry = JOptionPane.showInputDialog(null, "Invoice number must be between " +
LOW + " and " + HIGH + "\nEnter invoice number");
num = Integer...

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