Chapter 25, Problem 4PP

Program Plan Intro

Invoice Builder

Program plan:

Filename: “LineItem.java”

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

• Define a class “LineItem”.
  • Declare the class members “quantity” and “theProduct”.
  • Define the constructor “LineItem()”.
    • Initialize “quantity”.
    • Initialize “theProduct”.
  • Define a method “getTotalPrice()”,
    • Return the price.
  • Define a method “format()”,
    • Return the value in string format
  • Define a method “getQuantity()”,
    • Return the value of “quantity”.
  • Define a method “getProduct()”,
    • Return the value of “theProduct”.

Filename: “Product.java”

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

• Define a class “Product”.
  • Declare the class members “description” and “price”.
  • Define the constructor “Product()”.
    • Initialize “description”.
    • Initialize “price”.
  • Define a method “getDescription()”,
    • Return the “description”.
  • Define a method “getPrice()”,
    • Return the “price”.

Filename: “Address.java”

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

• Define a class “Address”.
  • Declare the class members “name”, “street”, “city”, “state” and “zip”.
  • Define the constructor “Address()”.
    • Initialize “name”.
    • Initialize “street”.
    • Initialize “city”.
    • Initialize “state”.
    • Initialize “zip”.
  • Define a method “format()”,
    • Return the value in string format
  • Define a method “getName()”,
    • Return the value of “name”.
  • Define a method “getStreet()”,
    • Return the value of “street”.
  • Define a method “getCity()”,
    • Return the value of “city”.
  • Define a method “getState()”,
    • Return the value of “state”.
  • Define a method “getZip()”,
    • Return the value of “zip”.

Filename: “Invoice.java”

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

• Define a class “Invoice”.
  • Declare the class members “billingAddress” and “items”.
  • Define the constructor “Invoice()”.
    • Initialize “billingAddress”.
    • Initialize “items”.
  • Define a method “add()”,
    • Define the object of “LineItem” called “anItem”.
    • Add item using “add()” method.
  • Define a method “getBillingAddress()”,
    • Return the value of “billingAddress”.
  • Define a method “getItems()”,
    • Return the value of “items”.
  • Define a method “format()”,
    • Declare a string variable “r” and set its value.
    • Iterate a “for” loop,
      • set the value of “r”.
        • Set the value of “r” to a string format.
        • Return the value of “r”.
  • Define a method “getAmountDue()”,
    • Declare a variable “amountDue”.
    • Iterate a “for” loop,
      • Set the value of “amountDue”.
        • Return the value of “amountDue”.

Filename: “InvoiceBuilder.java”

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

• Define a class “InvoiceBuilder”.
  • Declare the class members “builder” and “doc”.
  • Define the constructor “InvoiceBuilder()”.
    • Create an object “factory” of class “DocumentBuilderFactory”.
    • Set “builder”.
    • Initialize “items”.
  • Define a method “build()”,
    • Set “doc”.
    • Create an object “root” of “Element”.
    • Add “root” to “doc”.
    • Return the “doc”.
  • Define a method “createInvoice()”,
    • Create an element “invoiceElement” for invoice.
    • Create an element “addressElement”.
    • Create an element “itemsElement”.
    • Append “addressElement” to “invoiceElement”.
    • Append “itemsElement” to “invoiceElement”.
  • Define a method “createInvoice()”,
    • Create an element “addressElement” for address.
    • Create a text node “nameText”.
    • Create an element “nameElement” for name.
    • Append “nameText” to “nameElement”.
    • Create a text node “streetText”.
    • Create an element “streetElement” for street.
    • Append “streetText” to “streetElement”.
    • Create a text node “cityText”.
    • Create an element “cityElement” for city.
    • Append “cityText” to “cityElement”.
    • Create a text node “stateText”.
    • Create an element “stateElement” for state.
    • Append “stateText” to “stateElement”.
    • Create a text node “zipText”.
    • Create an element “zipElement” for zip.
    • Append “zipText” to “zipElement”.
    • Append “nameElement” to “addressElement”.
    • Append “streetElement” to “addressElement”.
    • Append “cityElement” to “addressElement”.
    • Append “stateElement” to “addressElement”.
    • Append “zipElement” to “addressElement”.
    • Return the value of “addressElement”.
  • Define a method “createItemList()”,
    • Create an element “itemsElement” for items.
    • Iterate a “for” loop,
      • Create an object “itemElement”.
      • Append “itemElement” to “itemsElement”.
        • Return the value of “itemsElement”.
  • Define a method “createItem()”,
    • Create an element “itemElement” for item.
    • Create an element “productElement”.
    • Create a text node “quantityText”.
    • Create an element “quantityElement”.
    • Append “quantityElement” to “quantityText”.
    • Append “itemElement” to “productElement”.
    • Append “itemElement” to “quantityElement”.
  • Define a method “createProduct()”,
    • Create a text node “descriptionText”.
    • Create a text node “priceText”.
    • Create an element “descriptionElement” for description.
    • Create an element “priceElement” for price.
    • Append “descriptionText” to “descriptionElement”.
    • Append “priceText” to “priceElement”.
    • Create an element “productElement” for product.
    • Append “descriptionElement” to “productElement”.
    • Append “priceElement” to “productElement”.
    • Return “productElement”.

Filename: “InvoiceBuilderDemo.java”

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

• Import the required packages.
• Define a class “InvoiceBuilderDemo”.
  • Define the method “main()”.
    • Define the object “samsAddress” of class “Address”.
    • Define the object “samsInvoice” of class “Invoice”.
    • Add the products using “add()” method.
    • Define the object “builder” of class “InvoiceBuilder”.
    • Define the DOM elements.
    • Define a variable “out”.
    • Print the variable “out”.