Question

Create a ShoppingCart class in java that simulates the operation of a shopping cart. The ShoppingCart instance should contain a BagInterface implementation that will serve to hold the Items that will be added to the cart. Use the implementation of the Item object provided in Item.java. Note that the price is stored as the number of cents so it can be represented as an int (e.g., an Item worth $19.99 would have price = 1999).

Your shopping cart should support the following operations:

•  Add an item

•  Add multiple quantities of a given item (e.g., add 3 of Item __)

•  Remove an unspecified item

•  Remove a specified item

•  Checkout – should "scan" each Item in the shopping cart (and display its

  information), sum up the total cost and display the total cost

•  Check budget – Given a budget amount, check to see if the budget is large

  enough to pay for everything in the cart. If not, remove an Item from the shopping cart, one at a time, until under budget.

  Write a driver program to test out your ShoppingCart implementation.

Answer 1

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*********************************************************

BagInterface.java

public interface BagInterface {
   Item bag[]=new Item[10];
  
   public void AddItemToBag(Item i);
  
}

*****************************************

ShoppingCart.java

import java.util.*;
import java.io.*;
public class ShoppingCart implements BagInterface{

   int index=0;
   @Override
   public void AddItemToBag(Item i) {
      
       bag[index]=i;
       index++;
       System.out.println("added to cart");
      
   }
   public void DisplayItems()
   {
       for(int i=0;i<bag.length-1;i++)
       {
           if(bag[i]!=null)
           {
           System.out.print(bag[i].getItemId()+"\t");
           System.out.print(bag[i].getItemName()+"\t");
           System.out.println(bag[i].getItemPrice());
          
           }
       }
   }
  
   public void Checkout()
   {
       DisplayItems();
       int sum=0;
       for(int i=0;i<bag.length-1 && bag[i]!=null ;i++)
       {
           sum=sum+bag[i].getItemPrice();
       }
       System.out.println("Total price is:"+sum);
   }
   public void addItem(Item i)
   {
       AddItemToBag(i);
   }
   public void addMultipleItem(Item items[])
   {
       for(int i=0;i<3;i++)
       {
           AddItemToBag(items[i]);
       }
   }
   public void removeItem(Item i)
   {
       for(int j=0;j<bag.length-1;j++)
       {
           if(bag[j].getItemId()==i.getItemId())
           {
               for(int k = j; k < bag.length - 1; k++){
       bag[k] = bag[k+1];
       }
       break;
           }
       }
   }
  

}
//********************************************************************

Item.java

public class Item {

   private int itemId;
   private int itemPrice;
   private String itemName;
   public String getItemName() {
       return itemName;
   }
   public void setItemName(String itemName) {
       this.itemName = itemName;
   }
   public int getItemId() {
       return itemId;
   }
   public void setItemId(int itemId) {
       this.itemId = itemId;
   }
   public int getItemPrice() {
       return itemPrice;
   }
   public void setItemPrice(int itemPrice) {
       this.itemPrice = itemPrice;
   }
   public Item(int itemId, int itemPrice, String itemName) {
       super();
       this.itemId = itemId;
       this.itemPrice = itemPrice;
       this.itemName =itemName;
   }
  
}
******************************************

Test.java

import java.util.*;
import java.io.*;
public class Test {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner sc=new Scanner(System.in);
       System.out.println("************Item List***********");
       System.out.println("id\tname\tprice\n");
       System.out.println("1\ta\t10\n");
       System.out.println("2\tb\t15\n");
       System.out.println("3\tc\t30\n");
       System.out.println("4\td\t20\n");
       Item i=new Item(1,10,"a");
       Item i1=new Item(2,15,"b");
       Item i2=new Item(3,30,"c");
       Item i3=new Item(4,20,"d");
       ShoppingCart scart=new ShoppingCart();
       System.out.println("adding first item");
       scart.addItem(i);
       scart.DisplayItems();
       System.out.println("adding second,third,fourth item at same time");
       Item itemarr[]=new Item[3];
       itemarr[0]=i1;
       itemarr[1]=i2;
       itemarr[2]=i3;
       scart.addMultipleItem(itemarr);
       scart.DisplayItems();
       System.out.println("Removing second item");
       scart.removeItem(i1);
       scart.DisplayItems();
       System.out.println("Calling checkout function");
       scart.Checkout();
      
   }

  
}
******************************************************

Output Screenshot