Chapter 25, Problem 6PP

Program Plan Intro

Draw Rectangle

Program plan:

Filename: “rectangle.java”

This program file is used to define a component “rectangle”.

• Define a component “x”.
• Define a component “y”.
• Define a component “width”.
• Define a component “height”.

Filename: “RectangleParser.java”

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

• Import the required packages.
• Define a class “RectangleParser”.
  • Declare the class members “builder” and “path”.
  • Define the constructor “RectangleParser()”.
    • Define the object of “DocumentBuilderFactory”.
    • Initialize “builder”.
    • Initialize “path”.
  • Define a method “parse()”.
    • Define the object of “File” named “f”.
    • define an object “doc”.
    • Get the rectangle element “x”.
    • Get the rectangle element “y”.
    • Get the rectangle element “width”.
    • Get the rectangle element “height”.
    • Define the object “rectangle” of “Rectangle”.’
    • Return the object “rectangle”.

Filename: “RectangleComponent.java”

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

• Define a class “RectangleComponent”.
  • Declare the class member “box”.
  • Define the constructor “RectangleComponent()”.
    • Initialize “box”.
  • Define a method “paintComponent()”,
    • Define the object of “Graphics2D” named “g2”.
    • Call “draw()”.

Filename: “JFrame.java”

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

• Import the required packages.
• Define a class “JFrame”.
  • Declare the class members “size”, “components” and “EXIT_ON_CLOSE”.
  • Define the method “setSize()”.
    • Set “size”.
  • Define a method “setDefaultCloseOperation()”,
  • Define a method “add()”,
    • Call the method “add()” to add “c”.
  • Define a method “setVisible()”,
    • Define a string “fileName”.
    • Define the object of “Rectangle”.
    • Define the object of “BufferedImage”.
    • Define the object of “Graphics2D”.
    • Call the method “setColor()”.
    • Call the method “fill()”.
    • Call the method “setColor()”.
    • Define “try” block.
    • Define “catch” block.
    • Call “dispose()”.

Filename: “RectangleViewer.java”

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

• Import the required packages.
• Define a class “RectangleViewer”.
  • Define the method “main()”.
    • Define the object “rp” of class “RectangleParser”.
    • Define the object “r” of class “Rectangle”.
    • Define the object “rectComponent” of class “RectangleComponent”.
    • Define the object “frame” of class “JFrame”.
    • Call “setDefaultCloseOperation()”.
    • Call the method “add()”.
    • Call the method “setSize()”.
    • Call the method “setVisible()”.