fabiandarga/exercise-java-tool-shop

Exercise: Tool Shop Management with Command Pattern

Objective

Create a command-line tool shop management program using the Command Pattern.
The program should allow users to add items to the warehouse, sell items, and print out a history of transactions.

Requirements

The Data does not need to be stored on the hard drive. You can keep it all in memory. But make sure the program runs in a loop to not lose your data between commands.

1. Tool Management:

   • The shop manages three types of items: Hammers, Saws, and Pincers.
   • Each type of item has a stack representing the quantity in the warehouse.
   • Selling an item reduces the stack and increases the money in the bank by specific amounts:
     • Hammer: 10€
     • Saw: 20€
     • Pincer: 8€

2. Commands:

   • Implement commands to add items, sell items, and print the transaction history.
   • Use the Command Pattern to encapsulate requests as objects.

3. Bonus:

   • Print out all previous transactions (adding items, removing items, and adding money).

Steps

1. Define Command Interface:

   • Create a Command interface with an execute method.

2. Implement Concrete Commands:

   • AddItemCommand: Adds items to the warehouse.
   • SellItemCommand: Sells items from the warehouse and adds money to the bank.
   • PrintTransactionHistoryCommand: Prints the transaction history.

3. Tool Shop:

   • Create a ToolShop class to manage the inventory and bank.
   • Implement methods to add items, sell items, and record transactions.

4. Transaction History:

   • Maintain a list to store transaction history.

5. Main Program:

   • Implement a loop to handle user input and execute commands.

Attention

Please make sure to ...

• not sell items when the stock is at 0
• give error message to the user when enters wrong input
• give success messages