Chapter 4, Problem 17E

Creating the class “MultipleCircles.java”:

• Import required packages.
• Define the class “MultipleCircles”.
  • Declare and define six constants.
  • Define the “main ()” method.
    • Launch the application.
  • Override the “start ()” method that throws “Exception”.
    • Create a group, scene, canvas and graphics context.
    • Declare required variables.
    • Loop from 0 through total number of circles using “for” loop.
      • Draw a circle and change the center position and diameter.
        • Add the canvas.
        • Set the title.
        • Add scene to the state and display it using “show ()” method.

Program:

//Import required packages

import javafx.application.Application;

import javafx.scene.canvas.Canvas;

import javafx.scene.Scene;

import javafx.scene.Group;

import javafx.stage.Stage;

import javafx.scene.canvas.GraphicsContext;

//Define the main class than extends application class

public class MultipleCircles extends Application

{

    //Six constants

    //Declare required constant variables

    //Set the number of circles

    public static final int CIRCLES = 10;

    //Set the number of diameter

    public static final int DIAMETER = 50;

    //Set x and y coordinates

    public static final int X_CIRCLE = 25;

    public static final int Y_CIRCLE = 100;

    //Set distance between adjacent centers

    public static final int CENTER_CHANGE = 20;

    //Set change in diameter

    public static final int DIAMETER_CHANGE = 10;

    //Define the main method

     public static void main(String[] args)

     {

         //Launch the application

        launch(args);

     }

     //Override the start method

     @Override

public void start(Stage primaryStage) throws Exception

     {

         //Create a group

        Group g = new Group();

        //Create a scene

        Scene s = new Scene(g);

        //Create canvas

        Canvas c = new Canvas(400, 400);

        //Create an object for graphics context

        GraphicsContext gc = c...