Question

in java

PART ONE =======================================

Below is the "RetailItem" class definition that we used in Chapter 6. Write a "CashRegister" class that leverages this "RetailItem" class which simulates the sale of a retail item. It should have a constructor that accepts a "RetailItem" object as an argument. The constructor should also accept an integer that represents the quantity of items being purchased. Your class should have these methods:

• getSubtotal: returns the subtotal of the sale, which is quantity times price. This method needs to get the price from the RetailItem object that was passed as an argument to the constructor.
• getTax: returns the tax on the purchase. Assume 6% as the tax rate.
• getTotal: returns the total of the sale, which is subtotal plus tax.

Demonstrate the class in a program that asks the user for the quantity of items being purchased, and then displays the sale's subtotal, tax amount, and total.

public class RetailItem {

   private String description;   // Item description
   private int unitsOnHand;      // Number of units on hand
   private double price;         // Unit price

   public RetailItem(){
      description = "";
      unitsOnHand = 0;
      price = 0.0;
   }

   public RetailItem(String d, int u, double p) {
      description = d;
      unitsOnHand = u;
      price = p;
   }

   public void setDescription(String d) {
      description = d;
   }

   public void setUnitsOnHand(int u) {
      unitsOnHand = u;
   }

   public void setPrice(double p) {
      price = p;
   }

   public String getDescription() {
      return description;
   }

   public int getUnitsOnHand() {
      return unitsOnHand;
   }

   public double getPrice() {
      return price;
   }
}

PART TWO ===================================================

Modify your program in Part One to create a file containing a sales receipt. The program should ask the user for the quantity of items being purchased, and generate a file with a receipt that displays something like this:

SALES RECEIPT
Unit price: $10.00
Quantity: 5
Subtotal: $50.00
Tax: $3.00
Total: $53.00

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// CashRegister.java

public class CashRegister {

      // attributes

      private RetailItem item;

      private int quantity;

      // constructor taking RetailItem object and quantity

      public CashRegister(RetailItem item, int quantity) {

            this.item = item;

            this.quantity = quantity;

      }

      // returns the subtotal

      public double getSubtotal() {

            return item.getPrice() * quantity;

      }

      // returns the tax amount

      public double getTax() {

            //applying 6% tax

            return getSubtotal() * 0.06;

      }

      // returns the total

      public double getTotal() {

            return getSubtotal() + getTax();

      }

}

// Test.java

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.Scanner;

public class Test {

      public static void main(String[] args) throws FileNotFoundException {

            // creating a RetailItem object with unit price 25

            RetailItem item = new RetailItem();

            item.setPrice(25);

            // defining a scanner to read input

            Scanner scanner = new Scanner(System.in);

            // asking for the quantity

            System.out.print("Enter the quantity of items being purchased: ");

            int qty = scanner.nextInt();

            // creating a CashRegister object with retail item and quantity

            CashRegister register = new CashRegister(item, qty);

            // displaying unit price, subtotal, tax and total to screen

            System.out.printf("Unit price: $%.2f\n", item.getPrice());

            System.out.printf("Subtotal: $%.2f\n", register.getSubtotal());

            System.out.printf("Tax: $%.2f\n", register.getTax());

            System.out.printf("Total: $%.2f\n", register.getTotal());

            // creating a file named receipt.txt and writing unit price, subtotal,

            // tax and total to file

            PrintWriter writer = new PrintWriter(new File("receipt.txt"));

            writer.println("SALES RECEIPT");

            writer.printf("Unit price: $%.2f\n", item.getPrice());

            writer.printf("Subtotal: $%.2f\n", register.getSubtotal());

            writer.printf("Tax: $%.2f\n", register.getTax());

            writer.printf("Total: $%.2f\n", register.getTotal());

            //closing file, saving results

            writer.close();

      }

}

/*OUTPUT*/

Enter the quantity of items being purchased: 40

Unit price: $25.00

Subtotal: $1000.00

Tax: $60.00

Total: $1060.00

Answer 2

public class RetailItem {

   private String description;   // Item description
   private int unitsOnHand;      // Number of units on hand
   private double price;         // Unit price

   public RetailItem(){
      description = "";
      unitsOnHand = 0;
      price = 0.0;
   }

   public RetailItem(String d, int u, double p) {
      description = d;
      unitsOnHand = u;
      price = p;
   }

   public void setDescription(String d) {
      description = d;
   }

   public void setUnitsOnHand(int u) {
      unitsOnHand = u;
   }

   public void setPrice(double p) {
      price = p;
   }

   public String getDescription() {
      return description;
   }

   public int getUnitsOnHand() {
      return unitsOnHand;
   }

   public double getPrice() {
      return price;
   }
}