Chapter 12, Problem 3PE

Program Plan Intro

Invoice

Program plan:

Filename: “Address.java”

This program file is used to define a class “Address”. In the code,

• Define a class “Address”.
  • Define the class members.
  • Define a constructor “Address()”.
    • Set the values for class members.
  • Define a method “getName()”.
    • Return the “name”.
  • Define a method “getStreet()”.
    • Return the “street”.
  • Define a method “getCity()”.
    • Return the “city”.
  • Define a method “getState()”.
    • Return the “state”.
  • Define a method “getZip()”.
    • Return the “zip”.

Filename: “Invoice.java”

This program file is used to define a class “Invoice”. In the code,

• Import the required packages.
• Define a class “Invoice”.
  • Define the class members.
  • Define a constructor “Invoice()”.
    • Set the class elements.
  • Define the method “add()”.
    • Create an object “anItem” of class “LineItem”.
    • Call the method “add()” recursively.
  • Define a method “getAmountDue()”.
    • Define the variable “amountDue”.
    • Iterate a “for” loop,
      • Calculate the value of “amountDue”.
        • Return the value of “amountDue”.
  • Define a method “getLineItem()”.
    • Return the item.
  • Define a method “getLineItemCount()”.
    • Return the size of the item.
  • Define a method “getAddress()”.
    • Return the “billingAddress”.

Filename: “InvoiceFormatter.java”

This program file is used to define a class “InvoiceFormatter”. In the code,

• Import the required packages.
• Define a class “InvoiceFormatter”.
  • Define the class members.
  • Define a constructor “InvoiceFormatter ()”.
    • Set the class elements.
  • Define a class “format()”.
    • Define the constants “DESCRIPTION_WIDTH”, “PRICE_WIDTH”, “QTY_WIDTH”, “TOTAL_WIDTH”.
    • Define a string variable “r” and get the invoice to it.
    • Iterate a “for” loop,
      • Get the items to “item”.
      • Format the invoice and assign it to “r”.
        • Call the method “format” to format the amount due and add the result to “r”.
        • Return “r”.

Filename: “LineItem.java”

This program file is used to define a class “LineItem”. In the code,

• Import the required packages.
• Define a class “LineItem”.
  • Define the class members.
  • Define a constructor “LineItem()”.
    • Set the class elements.
  • Define a method “getTotalPrice()”.
    • Multiply the price and quantity and return the result.
  • Define a method “getDescription()”.
    • Return the description.
  • Define a method “getPrice()”.
    • Return the price.
  • Define a method “getQuantity()”.
    • Return the quantity.

Filename: “Product.java”

This program file is used to define a class “Product”. In the code,

• Import the required packages.
• Define a class “Product”.
  • Define the class members.
  • Define a constructor “Product()”.
    • Set the class elements.
  • Define a method “getDescription()”.
    • Return the “description”.
  • Define a method “getPrice()”.
    • Return the “price”.

Filename: “InvoicePrinter.java”

This program file is used to define a class “InvoicePrinter”. In the code,

• Define a class “InvoicePrinter”.
  • Define a method “main()”.
    • Define the object “samsAddress” of class “Address”.
    • Define the object “samsInvoice” of class “Invoice”.
    • Call the method “add()” using “samsInvoice” to add the products.
    • Define the object of “InvoiceFormatter”.
    • Print the formatted invoice.