A Shopping Cart
In this exercise you will complete a class that implements a shopping cart as an array of items. The fileItem.java contains the definition of a class namedItem that models an item one would purchase. An item has a name, price, and quantity (the quantity purchased). The fileShoppingCart.java implements the shopping cart as an array of Item objects.
1. Complete theShopping Cart class by doing the following:
a. Declare an instance variablecart to be an array of Items and instantiatecart in the constructor to be an array holdingcapacity Items.
b. Fill in the code for theincrease Size method. Your code should be similar to that in Listing 7.8 of the text but instead of doubling the size just increase it by 3 elements.
c. Fill in the code for theadd To Cart method. This method should add the item to the cart and update thetota lPrice instance variable (note this variable takes into account the quantity).
d. Compile your class.
2. Write a program that simulates shopping. The program should have a loop that continues as long as the user wants to shop. Each time through the loop read in the name, price, and quantity of the item the user wants to add to the cart. After adding an item to the cart, the cart contents should be printed. After the loop print a "Please pay ..." message with the total price of the items in the cart
// *************************************************************** // Item.java
//
// Represents an item in a shopping cart.
// ***************************************************************
import java.text.NumberFormat;
public class Item
{
private String name;
private double price;
private int quantity;
// -------------------------------------------------------
// Create a new item with the given attributes.
// -------------------------------------------------------
public Item (String itemName, double itemPrice, int numPurchased)
{
name = itemName;
price = itemPrice;
quantity = numPurchased;
}
// -------------------------------------------------------
// Return a string with the information about the item
// -------------------------------------------------------
public String toString ()
{
NumberFormat fmt = NumberFormat.getCurrencyInstance();
return (name + "\t" + fmt.format(price) + "\t" + quantity + "\t"
+ fmt. format (price*quantity));
}
// -------------------------------------------------
// Returns the unit price of the item
// -------------------------------------------------
public double get Price()
{
return price;
}
// -------------------------------------------------
// Returns the name of the item
// -------------------------------------------------
public String get Name()
{
return name;
}
// -------------------------------------------------
// Returns the quantity of the item
// -------------------------------------------------
public int get Quantity()
{
return quantity;
}
}
// **********************************************************************
// ShoppingCart.java
//
// Represents a shopping cart as an array of items
// **********************************************************************
import java. text. Number Format;
public class Shopping Cart
{
private int item Count; // total number of items in the cart
private double totalP rice; // total price of items in the cart
private int capacity; // current cart capacity
// -----------------------------------------------------------
// Creates an empty shopping cart with a capacity of 5 items.
// -----------------------------------------------------------
public Shopping Cart()
{
capacity = 5;
item Count = 0;
tota lPrice = 0.0;
}
// -------------------------------------------------------
// Adds an item to the shopping cart.
// -------------------------------------------------------
public void add To Cart(String item Name, double price, int quantity)
{
}
// -------------------------------------------------------
// Returns the contents of the cart together with
// summary information.
// -------------------------------------------------------
public String to String()
{
Number Format fmt = Number Format. get Currency Instance();
String contents = "\n Shopping Cart\n";
contents += "\nItem\t\tUnit Price\tQuantity\tTotal\n";
for (int i = 0; i <>
contents += cart[i].toString() + "\n";
contents += "\nTotal Price: " + fmt.format(totalPrice);
contents += "\n";
return contents;
}
// ---------------------------------------------------------
// Increases the capacity of the shopping cart by 3
// ---------------------------------------------------------
private void increase Size()
{
}
}