Shopping Cart Pseudocode (Java) in mall system (beginner, Welcome to communication andy_zhou.china@outlook.com)

Shopping Item (item)

Properties

Product Object (the PID of the product is also the primary key of the shopping item) product

Purchase quantity (user input) Count

Subtotal (Purchase quantity * Product Unit Price (product.getshop_price)) subtotal = Count*product.getprice ()

Cart (CART)

Properties

Map collection (product PID, shopping Item) map (String, item)

Total amount (sum of subtotals for all shopping items, initial value of 0) total=0.0

Action

Add shopping items to Cart

Delete a shopping item from your shopping cart

Empty shopping Cart

Add a shopping cart process

1. Create a shopping item item

2. Determine if the shopping cart has this item

Remove items in Item pid:pid = Item.getproduct (). Getpid ();

Use Map.containskey (PID) to determine if the item is already included in the shopping cart's map collection

2.1 Cart contains this item: Modify the purchase quantity in item and modify the total amount in the cart

Modified Purchase Quantity: Count = Item.setcount (Map.get (PID). GetCount () +item.getcount ());

Total value of the revised amount: Total = Total (original sum) + item.getsubtotal () (sum of new amounts);

2.2 Cart does not contain this item: Add (product PID, shopping item) directly to the map collection and calculate the total amount

Add Map:map.put directly (Item.getproduct (). Getpid (), item);

Total + = Total (Original amount) + Item.getsubtotal

Add Shopping cart over end

Remove a shopping item from your shopping cart

1. Delete the shopping item Cartitem item = Map.Remove (PID) according to the PID;

2. Modify the total amount in the shopping cart

Shopping Cart Current Amount total = Total Shopping cart amount-Subtotal of deleted item amount

Total value of shopping cart-= item.getsubtotal ();

The end of the process of deleting a product in a shopping cart

Empty shopping Cart

1. Use the Clear () method to empty the shopping cart item map.clear ();

2. Modify the cart amount to 0.0 total = 0.0

Shopping Cart Pseudocode (Java) in the mall system, welcome to communicate [email protected] )