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).

Using the CLASSES BELOW 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 ***IMPORTANT

  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 ***IMPORTANT

  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.

*Item Class*

/**

* Item.java - implementation of an Item to be placed in ShoppingCart

*/

public class Item

{

private String name;

private int price;

private int id;//in cents

  

//Constructor

public Item(int i, int p, String n)

{

name = n;

price = p;

id = i;

}

  

public boolean equals(Item other)

{

return this.name.equals(other.name) && this.price == other.price;

}

  

//displays name of item and price in properly formatted manner

public String toString()

{

return name + ", price: $" + price/100 + "." + price%100;

}

  

//Getter methods

public int getPrice()

{

return price;

}

public String getName()

{

return name;

}

}

BAG INTERFACE CLASS

/**

* BagInterface.java - ADT Bag Type

* Describes the operations of a bag of objects

*/

public interface BagInterface<T>

{

//getCurrentSize() - gets the current number of entries in this bag

// @returns the integer number of entries currently in the bag

public int getCurrentSize();

  

//isEmpty() - sees whether the bag is empty

// @returns TRUE if the bag is empty, FALSE if not

public boolean isEmpty();

  

//add() - Adds a new entry to this bag

// @param newEntry - the object to be added to the bag

// @returns TRUE if addition was successful, or FALSE if it fails

public boolean add(T newEntry);

  

//remove() - removes one unspecified entry from the bag, if possible

// @returns either the removed entry (if successful), or NULL if not

public T remove();

  

//remove(T anEntry) - removes one occurrence of a given entry from this bag, if possible

// @param anEntry - the entry to be removed

// @returns TRUE if removal was successful, FALSE otherwise

public boolean remove(T anEntry);

  

//clear() - removes all entries from the bag

public void clear();

  

//contains() - test whether this bag contains a given entry

// @param anEntry - the entry to find

// @returns TRUE if the bag contains anEntry, or FALSE otherwise

public boolean contains(T anEntry);

  

//getFrequencyOf() - count the number of times a given entry appears in the bag

// @param anEntry - the entry to count

// @returns the number of time anEntry appears in the bag

public int getFrequencyOf(T anEntry);

  

//toArray() - retrieve all entries that are in the bag

// @returns a newly allocated array of all the entries in the bag

// NOTE: if bag is empty, it will return an empty array

public T[] toArray();

  

}

Answer 1

According to the above given input for shopping cart we have to write BagInterface class, shopping cart class,item class, Test class each of these are as follows:

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)

{

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:

Item list

id name price

1 a 10

2 b 15

3 c    30

4 d 20

adding first item

added to cart

1 a 10

adding second,third,fourth item at same time

added to cart

added to cart

added to cart

1 a 10

2 b 15

3 c 30

4 d 20

Removing second item

1 a 10

3 c 30

4 d 20

calling checkout function

1 a 10

3 c 30

4 d 20

Total price is:60

hope u like it.