Write a class named Octagon (

Octagon.java

) that extends the following abstract

GeometricObject

class (same as the code in Listing 13.1 on pages 496-498 in the

required textbook by Liang, 10th edition) and implements the

Comparable

and

Cloneable

interfaces.

//GeometricObject.java: The abstract GeometricObject class

public

abstract

class

GeometricObject {

private

String color = "white";

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 + " color: " + color + " and filled: " + filled;

}

/** Abstract method getArea */

public

abstract

double

getArea();

/** Abstract method getPerimeter */

public

abstract

double

getPerimeter();

}

Assume that all eight sides of the octagon are of equal length. The area can be computed

using the following formula:

area

= (2 + 4 / sqrt(2)) *

side

*

side

Draw the UML diagram that involves Octagon, GeometricObject, Comparable, and

Cloneable.

Write a test program (

OctagonTest.java

) that creates an Octagon object with side value

5.00 and displays its area and perimeter. Create a new object using the

clone

method and

compare the two objects using the

compareTo

method.

The output should look exactly like the following:

Area of the octagon with side value 5.00 is 120.71

Perimeter of the octagon with side value 5.00 is 40.00

Comparison result between an octagon and its clone: 0