Chapter 13, Problem 13.9PE

Program Plan Intro

Circle.java

Program Plan:

• Include a class name named “Exercise_13_09”.
  • Declare the main() method.
  • Create three Circle objects and assign values to them using the Circle class.
  • Display the radius of each circle object referencing Circle class.
  • Display if circle 1 is equal to circle 2 or not referencing Circle class.
  • Close the main() method.
  • Close the class.
• Include an abstract class “GeometricObject”.
  • Declare all the data types of the variables.
  • Construct a default geometric object.
  • Construct a geometric object with color and filled value.
  • Assign color and fill to the object.
  • Set a new color.
  • Define an isFilled method returns filled and since filled is Boolean; the get method is named isFilled.
  • Set a new filled and getDateCreated method.
  • Override toString function to return output.
  • Define Abstract method getArea.
  • Define Abstract method getPerimeter.
  • Close class.
• Include a class “Circle” that extends the class GeometricObject and implements Comparable.
  • Declare radius variable.
  • Create a Circle constructor.
  • Assign values to radius.
  • Create a function to set color and set fill in the Circle.
  • Create a Function to return radius.
  • Create a function to set a new radius.
  • Create an override function to return area.
  • Create an override function that returns true if objects radii are the same.
  • Create an override function to implement compareTo method.
  • Create a function that returns true if objects radii are the same.
  • Close class.