
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 method to set the invoice number
public void setInvoiceNumber(int num)
{
invoiceNumber = num;
}
//Define a method to set the amount of sale
public void setSaleAmount(double amt)
{
saleAmount = amt;
//Calculate the amount of sales tax
tax = saleAmount * RATE;
}
/*Define a method to display the invoice number,
amount of sale, and amount of sales tax*/
public void display()
{
//Print the result
System.out.println("Invoice #" + invoiceNumber +
" Amount of sale: $" + saleAmount + " Tax: $" + tax);
}
}
File name: “PurchaseArray.java”
//Import necessary header files
import java.util.*;
//Define a class named PurchaseArray
public class PurchaseArray
{
//Define a main method
public static void main(String[] args)
{
//Declare a purchases object
Purchase[] purchases = new Purchase[5];
//Declare the variables
int num;
double amount;
String entry;
//Create an object for Scanner class
Scanner input = new Scanner(System.in);
//Declare the variables and initialize the values
int x;
final int LOW = 1000, HIGH = 8000;
//For loop to be executed until x exceeds 5
for(x = 0; x < purchases.length; ++x)
{
purchases[x] = new Purchase();
//Prompt the user to enter an invoice number
System.out.print("Enter invoice number >> ");
num = input...

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Chapter 8 Solutions
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