(The ComparableCircle class) Define a class named ComparableCircle that extends Circle and implements Comparable. Draw the UML diagram and implement the compareTo method to compare the circles on the basis of area

/*********************************************************************************
* (The ComparableCircle class) Define a class named ComparableCircle that        *
* extends Circle and implements Comparable. Draw the UML diagram and implement   *
* the compareTo method to compare the circles on the basis of area. Write a test *
* class to find the larger of two instances of ComparableCircle objects.         *
*********************************************************************************/
public class Exercise_13_06 {
	/** Main method */
	public static void main(String[] args) {
		// Create two instances of ComparableCircle objects
		ComparableCircle comparableCircle1 = new ComparableCircle(12.5);
		ComparableCircle comparableCircle2 = new ComparableCircle(18.3);

		// Display comparableCircles
		System.out.println("\nComparableCircle1:");
		System.out.println(comparableCircle1);
		System.out.println("\nComparableCircle2:");
		System.out.println(comparableCircle2);

		// Find and display the larger of the two ComparableCircle objects
		System.out.println((comparableCircle1.compareTo(comparableCircle2) == 1 
			? "\nComparableCircle1 " : "\nComparableCircle2 ") + 
			"is the larger of the two Circles");
	}
}

Circle.java

public class Circle
		extends GeometricObject {
	private double radius;

	public Circle() {
	}

	public Circle(double radius) {
		this.radius = radius;
	}

	public Circle(double radius, 
		String color, boolean filled) {
		this.radius = radius;
		setColor(color);
		setFilled(filled);
	}

	/** Return radius */
	public double getRadius() {
		return radius;
	}

	/** Set a new radius */
	public void setRadius(double radius) {
		this.radius = radius;
	}

	@Override /** Return area */
	public double getArea() {
		return radius * radius * Math.PI;
	}

	/** Return diameter */
	public double getDiameter() {
		return 2 * radius;
	}

	@Override /** Return perimeter */
	public double getPerimeter() {
		return 2 * radius * Math.PI;
	}

	@Override /** Implement the toString method in GeometricObject */
	public String toString() {
		return super.toString() + "\nDate created: " + getDateCreated() +
			"\nRadius: " + radius;
	}
}

ComparableCircle.java 

/**************************************
*         ComparableCircle            *
*-------------------------------------*
* +ComparableCircle()                 *
* +ComparableCircle(radius: double)   *
* +ComparableCircle(radius: double,   *
*		color: String, filled: boolean) *
**************************************/

public class ComparableCircle extends Circle 
		implements Comparable<ComparableCircle> {

	public ComparableCircle() {
	}

	/** Construct a CoparableCircle with specified radius */
	public ComparableCircle(double radius) {
		super(radius);
	}

	/** Construct a CoparableCircle with specified properties */
	public ComparableCircle(double radius, String color, boolean filled) {
		super(radius, color, filled);
	}

	@Override // Implement the compareTo method defined in Comparable
	public int compareTo(ComparableCircle o) {
		if (getArea() > o.getArea())
			return 1;
		else if (getArea() < o.getArea())
			return -1;
		else
			return 0;
	}

	@Override // Implement the toString method defined in Circle
	public String toString() {
		return super.toString() + "\nArea: " + getArea();
	}
}

GeometricObject.java

public abstract class GeometricObject {
	private String color = "while";
	private boolean filled;
	private java.util.Date dateCreated;

	/** Construct a default geometric object */
	protected GeometricObject() {
		dateCreated = new java.util.Date();
	}

	/** Construct a geometric object with color and filled value */
	protected GeometricObject(String color, boolean filled) {
		dateCreated = new java.util.Date();
		this.color = color;
		this.filled = filled;
	}

	/** Return color */
	public String getColor() {
		return color;
	}

	/** Set a new color */
	public void setColor(String color) {
		this.color = color;
	}

	/** Return filled. Since filled is boolean,
	 *  the get method is named isFilled */
	public boolean isFilled() {
		return filled;
	}

	/** Set a new filled */
	public void setFilled(boolean filled) {
		this.filled = filled;
	}

	/** Get dateCreated */
	public java.util.Date getDateCreated() {
		return dateCreated;
	}

	@Override
	public String toString() {
		return "created on " + dateCreated + "\ncolor: " + color +
			" and filled: " + filled;
	}

	/** Abstract method getArea */
	public abstract double getArea();

	/** Abstract method getPerimeter */
	public abstract double getPerimeter();
}