Chapter 10, Problem 8PP

Program Plan Intro

Plotting HELLO string

Program Plan:

Filename: “HelloComponent.java”

• Import the required header files in the program.
• Declare the “HelloComponent” class that extends from the “JComponent” class.
  • Define the “paintComponent” method.
    • Create an object for “Graphics2D” class.
    • Create an object for “LetterH” class and pass the values to the class.
    • Draw the “H” letter.
    • Create an object for “LetterE” class and pass the values to the class.
    • Draw the “E” letter.
    • Create an object for “LetterL” class and pass the values to the class.
    • Draw the “L” letter.
    • Create an object for “LetterL” class and pass the values to the class.
    • Draw the “L” letter.
    • Create an object for “LetterO” class and pass the values to the class.
    • Draw the “O” letter.

Filename: “HelloViewer.java”

• Import the required packages.
• Declare the class “HelloViewer”.
  • Declare the “main ()” method.
    • Create an object for “JFrame” class.
    • Set the window size.
    • Set the window title.
    • Close the window.
    • Create an object for “HelloComponent” class.
    • Add the component to the class.
    • Set the window as visible.

Filename: “LetterE.java”

• Import the required header files in the program.
• Declare the “LetterE” class.
  • Declare the required variables.
  • Define the constructor.
    • Set the values to the declared variables.
  • Define the “draw” method.
    • Declare the required variables.
    • Create the objects for “Line2D” class and pass the values to draw the horizontal lines in “E” letter.
    • Create an object for “Line2D” class and pass the values to draw the vertical line in the “E” letter.
    • Draw the “E” letter by calling the “draw” method with the different objects.

Filename: “LetterL.java”

• Import the required header files in the program.
• Declare the “LetterL” class.
  • Declare the required variables.
  • Define the constructor.
    • Set the values to the declared variables.
  • Define the “draw” method.
    • Create the objects for “Point2D” class and pass the different values to draw the “L” letter.
    • Create an object for “Line2D” class and pass the values to draw the horizontal line in “L” letter.
    • Create an object for “Line2D” class and pass the values to draw the vertical line in the “L” letter.
    • Draw the “L” letter by calling the “draw” method with the different objects.

Filename: “LetterH.java”

• Import the required header files in the program.
• Declare the “LetterH” class.
  • Declare the required variables.
  • Define the constructor.
    • Set the values to the declared variables.
  • Define the “draw” method.
    • Declare the required variables.
    • Create the objects for “Line2D” class and pass the values to draw the vertical lines in “H” letter.
    • Create an object for “Line2D” class and pass the values to draw the horizontal line in the “H” letter.
    • Draw the “H” letter by calling the “draw” method with the different objects.

Filename: “LetterO.java”

• Import the required header files in the program.
• Declare the “LetterO” class.
  • Declare the required variables.
  • Define the constructor.
    • Set the values to the declared variables.
  • Define the “draw” method.
    • Declare the required variables.
    • Create an object for “Ellipse2D” class and pass the values to draw the “O” letter.
    • Draw the “O” letter by calling the “draw” method with the object.