Question

Please add comments to this code!

JAVA code:

import java.util.ArrayList;
public class ShoppingCart {
private final ArrayList<ItemOrder> itemOrder;
   private double total = 0;
   private double discount = 0;

   ShoppingCart() {
       itemOrder = new ArrayList<>();
       total = 0;
   }

   public void setDiscount(boolean selected) {
       if (selected) {
           discount = total * .1;
       }
   }

   public double getTotal() {
       total = 0;
       itemOrder.forEach((order) -> {
           total += order.getPrice();
    });
       return total - discount;
   }

   /***
   *
   * @param order
   * @return
   */
   public boolean add(ItemOrder order) {
       for (int i = 0; i < itemOrder.size(); i++) {
           ItemOrder temp = itemOrder.get(i);
           if ((temp.getItem()).equals(order.getItem())) {
               itemOrder.set(i, order);
               return true;
           }
       }
       itemOrder.add(order);
       return true;
   }

}

Thanks!!

Answer 1

import java.util.ArrayList;

//Class name Shopping cart
public class ShoppingCart {

//ArrayList of type ItemOrder
private final ArrayList<ItemOrder> itemOrder;
   private double total = 0;
   private double discount = 0;

//Default Constructor initiliaze the member vaiables to 0

   ShoppingCart() {
       itemOrder = new ArrayList<>();
       total = 0;
   }

   public void setDiscount(boolean selected) {

//Sets the discount for a particular total amount
       if (selected) {

//Discount is 10 % of total
           discount = total * .1;
       }
   }

//Calculate the total amount of all the orders in the array list and return the total - discount amount

   public double getTotal() {
       total = 0;
       itemOrder.forEach((order) -> {
           total += order.getPrice();
    });
       return total - discount;
   }

   /***
   *
   * @param order
   * @return
   */

//Add an item to the array list.

//If the item already exists in the array list then

//Replace the order with the new order and return true

//Else if it is not present then add to the arraylist at the end
   public boolean add(ItemOrder order) {
       for (int i = 0; i < itemOrder.size(); i++) {
           ItemOrder temp = itemOrder.get(i);
           if ((temp.getItem()).equals(order.getItem())) {
               itemOrder.set(i, order);
               return true;
           }
       }
       itemOrder.add(order);
       return true;
   }

}