Chapter 20, Problem 20.9PE

Program Plan Intro

Program to remove the first largest ball

Program plan:

• Import the required packages into the program.
• In the Exercise20_09 class,
  • In start() method,
    • Create an object for buttons and HBox.
    • Call addAll() method to add all buttons.
    • Set the action adds or remove a ball.
    • Pause and restart animation.
    • Scroll bar used to control speed of animation.
    • Set the maximum speed.
    • Create a scene, put it into pane in stage, and display the stage.
  • Define the MultipleBallPane class,
    • Define the add() method to add the ball.
    • Define the subtract() method to subtract the ball.
    • Define the play() method to play the ball.
    • Define the pause() method to pause the ball.
    • Define the increaseSpeed() method to increase the speed.
    • Define the decreaseSpeed() method to decrease the speed.
    • Define the DoubleProperty() method to return the rate property.
    • Define the moveBall() method to adjust the ball position and identify the collision.
• In the Ball class extends the Circle class.
  • Declare the required variables.
  • Define compareTo() method to return the value.
  • In the main() method,
    • Launch the project.