Chapter 25, Problem 9PP

Program Plan Intro

Polygon

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: “PolygonComponent.java”

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

• Import the required packages.
• Define a class “PolygonComponent”.
  • Declare the class members “polygon”.
  • Define a method “PolygonComponent()”.
    • Define “ploygon”.
  • Define a method “paintComponent()”.
    • Define Graphics2D “g2”.

Filename: “PolygonParser.java”

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

• Import the required packages.
• Define a class “PolygonParser”.
  • Declare the class members “builder”, “path”.
  • Define the constructor “PolygonParser()”.
    • Declare DocumentBuilderFactory “factory”.
    • Declare “builder”.
    • Declare XPathFactory “xpfactory”.
    • Declare “path”.
  • Define a method “parse()”.
    • Declare file “f”.
    • Declare Document “doc”.
    • Define statement “points”.
    • Inside the for loop,
      • Define variables “x”, “y”.

Filename: “PolygonViewer.java”

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

• Import the required packages.
• Define a class “PolygonViewer”.
  • Define class main.
  • Define PolygonParser “rp”.
  • Define PolygonComponent “ellipsecomponent”.
  • Define JFrame “frame”.

Filename: “polygon.xml”

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

• Open the polygon tag.
  • Open the point tag.
  • Create an element named “x”.
  • Create an element named “y”.
  • Close the point tag.
  • Open the point tag.
  • Create an element named “x”.
  • Create an element named “y”.
  • Close the point tag.
  • Open the point tag.
  • Create an element named “x”.
  • Create an element named “y”.
  • Close the point tag.
  • Open the point tag.
  • Create an element named “x”.
  • Create an element named “y”.
  • Close the point tag.
  • Open the point tag.
  • Create an element named “x”.
  • Create an element named “y”.
  • Close the point tag.
• Close the polygon tag.