aws | 代做quiz | java – Design an e-Commerce experience using java

2021-07-31

Design an e-Commerce experience using java

aws | 代做quiz | java – 这个题目属于一个aws的代写任务, 涵盖了aws/java等方面, 这是值得参考的quiz代写的题目

java代写 代写java

CSCI 101:  quiz 3

Design an e-Commerce experience using java.

Using Java, design and create an ecommerce store. The store has a catalog items listed in catalog.txt file, attahched. When you run your main method, your logic first presents the user with the following main menu:

*** Main Menu*** Select one of the following options by entering the digit next to it:

  1. List the store catalog items
  2. Add an item to your cart
  3. Remove an item from your cart
  4. Change the quantity of an item in your cart
  5. View the items in your cart
  6. Empty your cart
  7. Checkout 9 – Exit store

Store Functionality

List the store catalog items When the shopper selects this option, your code would load the items from the attached file called, catalog.txt and display it to the user in the console. Then display the main menu and ask the user to select an action by entering one of the digits. Catalog.txt is structured as follows Item Id Description Category Quantity unit price

Add an item to your cart

  • When the shopper selects this option, your logic must ask the user to enter item id and then enter the quantity.
  • If the user enters an item id that is not in the catalog, then your logic should handle it gracefully and display exception message The item is not found then display the main menu
  • If the user enters more quantity than whats available in the catalog, present the user with a graceful exception message The requested quantity is more than whats currently available then display the main menu
  • Once the item id and the quantity are valid, add the item and the quantity into the shopping cart then display the message item is added to your cart, then display the main menu
  • If the item exists already in the cart, make sure the total quantity is not exceeding whats offered in the catalog.

o If the total quantity is exceeding whats in the catalog, present the user with a
graceful exception message The requested quantity is more than whats
currently available then display the main menu

Remove an item from your cart

  • When the shopper selects this option, your logic must ask the user to enter item id that needs to be removed from the cart.
  • Validate the item id is indeed in the cart and remove it. o If the user enters an item id that is not in the cart, handle it gracefully by displaying the error message The item id is not in the cart then display the main menu. o If the item is in the cart, you remove it, display a message item removed successfully then display main menu

Change the quantity of an item in your cart

  • When the shopper selects this option, your logic must ask the user to enter item id and the new quantity that need to be updated in the cart
  • Validate user input, o if the user input incorrect item id, display the exception message, The item not found then display the main menu.
  • if the user enters quantity greater than whats in the catalog, handle it gracefully and display the exception message The requested quantity is more than whats currently available then display the main menu
  • If the user enters quantity of zero, remove the item from the shopping cart, and display a message, item removed from cart, then display the main menu

View the items in your cart

  • When the shopper selects this option, display the content of the cart as follows (each column is 20 char width) Item Id Item Description Item Quantity Item Category Unit Price Total Price
  • Then display the main menu and ask the user to select an action from the main menu.

Empty your cart

  • Remove all the items from the cart, display message Your cart is empty now then display the main menu.
    • If a user tries to empty the cart before any items added to it, your logic should handle it gracefully and display exception message Cart not found then display the main menu

Checkout

  • When the shopper selects this option, your logic must ask the user to enter any coupon they might have or enter 000 to proceed with a checkout.
  • The store offers three types of coupons: o EEE offers 30% off = electronics o AAA offers 25% on Apparels o FFF offers 10% on Food o If the shopper enters an incorrect coupon, handle it gracefully and display the exception message Invalid Coupon then just proceed with the check out. o The shopper is allowed to enter only one coupon which get applied on the right category in the shoppers cart. If the user enters invalid coupon, they cant enter another one just display the error message above and proceed with the check out. o If the shopper entered the wrong coupon which discounted no items, example: cart has electronics and the shopper enters FFF coupon, handle it gracefully and display the exception message Invalid Coupon then just proceed with the check out.
  • Then print out the receipt into a file and name it receipt.log in the same directory as your code then exit the program at this point. o receipt.log should have the following format Date: <todays date> Number of items purchased: List of items purchased, Subtotal: Total Tax: – If the item is of category o Electronic category, tax is 8% o Apparel category, tax is 5% o Food, no tax Total: <Subtotal + Tax>
o Example of: receipt.log file

***Welcome to your  java ecommerce shop***
Date: 05/05/
Number of items purchased: 4
List of items in a column format 20 char for col width; as follows:
<Item id > <description> <qty> <unit price> <total price>
<Item id > <description> <qty> <unit price> <total price>
...
<Item id > <description> <qty> <unit price> <total price>

*** Have a nice day***

If the user selects exit store option, your logic will display the message Have a nice day! then just exit the program.

Error handling: Your design should have three custom exceptions used accordingly

  • CartNotFoundException: used if a user trying to remove a cart before any items were added to it and display the message Cart not found
  • ItemNotFoundException: used if the user is trying to add an item that doesnt exist in the catalog or if the user is trying to remove an item that is not in the cart and display the message The item is not found
  • InvalidCuponException: used if the user is trying to apply an invalid coupon during check out and display the message Invalid Coupon
  • InvalidQuantityExeption: used if the user is trying to add or update a quantity greater to whats in the catalog and display the message The requested quantity is more than whats currently available
Assumption :
  • All quantities & prices entered by the user are greater than 0 (dont validate negative or non numeric entries )
  • Item Id is unique for each entry in the file catalog.txt
  • Consider all values in catalog.txt as strings except quantity and price.
  • If the user enters any digit that is not listed in the main menu, display the essage ivalid entry then just display the main menu again
  • Copy catalog.txt and paste it in the same package where you have your code.
  • The file receipt.log should be stored in the same directory where your code is

Note:

  • This is a design problem. You design your classes however you think appropriate in order to achieve the desired flow of your ecommerce logic.
  • There should be a basic structure to your design which consists of o Ecommerce class with main method. o ShoppingCart class. o CatalogItem class. o Plus you can add any classes you like to complete to design your code. Rubric
  • If any of your classes dont compile, automatic 0
  • Fl aws in the ecommerce flow == 1 points for each flaw identified
  • Incorrect use of exception or errors are not handled gracefully == – 2 points for each
    • 1 point if there is no comments in your code … dont over comment either, just enough to share some info about each block of code.
  • Dont include receipt.log I will generate it when I run your code.
Good Luck
Dr. Nassar