Chapter 25, Problem 7PP

Program Plan Intro

Ellipse

Program plan:

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 class members “size”, “components”.
  • Define a constructor “setSize”.
    • Initialize the class members.
  • Define a method “setDefaultCloseOperation()”.
  • Define a method “add()”.
  • Define a method “setVisible()”.
    • Define string.
    • Declare variable rect.
    • Define graphics and then set the properties.
    • Inside the try statement, Declare string extension.
    • Inside the catch statement, print the statement.

Filename: “EllipseComponent.java”

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

• Import the required packages.
• Define a class “EllipseComponent”.
  • Declare the class members “Ellipse2D”.
  • Define the constructor “EllipseComponent()”.
    • Define “ellipse”.
  • Define a method “paintComponent()”.
    • Define Graphics2D “g2”.

Filename: “EllipseParser.java”

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

• Import the required packages.
• Define a class “EllipseParser”.
  • Declare the class members “builder”, “path”.
  • Define the constructor “EllipseParser()”.
    • Declare DocumentBuilderFactory “factory”.
    • Declare “builder”.
    • Declare XPathFactory “xpfactory”.
    • Declare “path”.
  • Define a method “parse()”.
    • Declare file “f”.
    • Declare Document “doc”.
    • Define variables “x”, “y”, “width” and “height”.
    • Declare Ellipse2D “ellipse”

Filename: “EllipseViewer.java”

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

• Import the required packages.
• Define a class “EllipseViewer”.
  • Define class main.
  • Define EllipseParser “rp”.
  • Define EllipseComponent “ellipsecomponent”.
  • Define JFrame “frame”.

Filename: “ellipse.xml”

This program file is used to define an XML file “ellipse”. In the code,

• Create an element named “x”.
• Create an element named “y”.
• Create an element named “width”.
• Create an element named “height”.