Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Chapter 11, Problem 5PP
Program Plan Intro

To display a scrolling message in a panel

Program plan:

  • In the file ScrollingComponent.java”, import necessary packages, and create a class ScrollingComponent”,
    • Declare the variables.
    • Define the constructor to create a scrolling message at position x, y.
    • Define the method “paintComponent()” to paint the component.
    • Define the method “advancePosition()” to advance the message one step in the current direction.
    • Define the method “changeDirection()” to change direction of scrolling message.
    • Define the method “setMessage()” to change the message.
  • In the file ScrollingFrame.java”, import necessary package, and create a class ScrollingFrame”,
    • Declare an object for “ScrollingComponent”.
    • Initialize the variables.
    • Define the constructor to create necessary panels and create all necessary components.
    • Create Listener class for update scrolling.
    • Create Listener class for changing direction.
    • Create Listener class to increase speed.
    • Create Listener class to slower speed.
    • Create Listener class to update foreground.
    • Create Listener class to update background.
    • Create Listener class to update message box.
    • Create Listener class to change font's name.
    • Create Listener class to change font's style.
    • Create Listener class to change font's size.
  • In the file Scrolling.java”, import necessary packages, and create a class Scrolling”,
    • Define a method “main()”,
      • Create an object of “JFrame”.
      • Set the frame’s title.
      • Set the operation on the frame.
      • Make the frame visible.

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