Question

Create a class named Purchase. Each Purchase contains an invoice number, amount of sale, and amount of sales tax. 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.

Here is the provided code:

import java.util.*;
public class CreatePurchase
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
Purchase purch = new Purchase();
int num;
double amount;
String entry;
final int LOW = 1000, HIGH = 8000;
System.out.println("Enter invoice number");
entry = input.next();
num = Integer.parseInt(entry);
while(num <= LOW || num >= HIGH)
{
System.out.println("Invoice number must be between " +
LOW + " and " + HIGH + "\nEnter invoice number");
entry = input.next();
num = Integer.parseInt(entry);
}
  
System.out.println("Enter sale amount");
entry = input.next();
amount = Double.parseDouble(entry);
while(amount < 0)
{
System.out.println("Enter sale amount");
entry = input.next();
amount = Double.parseDouble(entry);
}
purch.setInvoiceNumber(num);
purch.setSaleAmount(amount);
purch.display();
}
}

------------------------------------------------------------------------------------------------

Other Class:

_--_____________________________

public class Purchase {
private int invoiceNumber;
private double saleAmount;
private double tax;
private static final double RATE = 0.05;
public void setInvoiceNumber(int num) {
}
public void setSaleAmount(double amt) {
}
public double getSaleAmount() {
}
public int getInvoiceNumber() {
}
public void display() {
System.out.println("Invoice #" + invoiceNumber +
" Amount of sale: $" + saleAmount + " Tax: $" + tax);
}
}

pls help

Answer 1

import java.util.*;
public class CreatePurchase
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        int num;
        double amount;
        String entry;
        final int LOW = 1000, HIGH = 8000;
        System.out.println("Enter invoice number");
        entry = input.next();
        num = Integer.parseInt(entry);
        while(num <= LOW || num >= HIGH)
        {
            System.out.println("Invoice number must be between " +
                    LOW + " and " + HIGH + "\nEnter invoice number");
            entry = input.next();
            num = Integer.parseInt(entry);
        }

        System.out.println("Enter sale amount");
        entry = input.next();
        amount = Double.parseDouble(entry);
        while(amount < 0)
        {
            System.out.println("Enter sale amount");
            entry = input.next();
            amount = Double.parseDouble(entry);
        }
        Purchase purch = new Purchase(num, amount);

        purch.setInvoiceNumber(num);
        purch.setSaleAmount(amount);
        purch.display();
    }
}

//////////////////////////////////////////////////////////////////////////////////////////////

public class Purchase {
    private int invoiceNumber;
    private double saleAmount;
    private double tax;
    private static final double RATE = 0.05;

    public Purchase(int invoiceNumber, double saleAmount) {
        this.invoiceNumber = invoiceNumber;
        this.saleAmount = saleAmount;
        tax = saleAmount*0.05;
    }

    public void setInvoiceNumber(int num) {
    }
    public void setSaleAmount(double amt) {
    }
    public double getSaleAmount() {
        return saleAmount;
    }
    public int getInvoiceNumber() {
        return invoiceNumber;
    }
    public void display() {
        System.out.println("Invoice #" + invoiceNumber +
                " Amount of sale: $" + saleAmount + " Tax: $" + tax);
    }
}