Chapter 13, Problem 13.12PE

Program Plan Intro

SumArea.Java

Program Plan:

• Include a class name named “Exercise_13_12”.
  • Declare the main() method.
  • Create an array of four objects two of circle type and two of rectangle type.
  • Print total elements in the array.
  • Create a function that returns the sum of the areas of all the geometric objects in an array.
  • Close the main() method.
  • Close the class.
• Include an abstract class “GeometricObject” that implements Comparable.
  • 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.
  • Override function to implement the compareTo method.
  • Abstract method getMax to return maximum object.
  • Define Abstract method getArea.
  • Define Abstract method getPerimeter.
  • Close class.
• Include a class “Rectangle” that extends the class GeometricObject class.
  • Declare width and height of rectangle.
  • Create a Rectangle constructor.
  • Assign values to height and width.
  • Assign rectangle values to all attributes.
  • Create a function to return width.
  • Create a function to return radius.
  • Create a function to set a new width.
  • Create a function to return height.
  • Create a function to set a new height.
  • Create an override function to return area.
  • Create an override function to return Perimeter.
  • Overriding function to return String description of this rectangle.
  • Close class.
• Include a class “Circle” that extends the class GeometricObject class.
  • 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 to return perimeter.
  • Create an override string description of circle object.
  • Close class.