( The Octagon class ) Write a class named Octagon that extends GeometricObject a

Question

(The Octagon class) Write a class named Octagon that extends GeometricObject and implements the Comparable and Cloneable interfaces. Assume that all eight sides of the octagon are of equal length. The area can be computed using the following formula:

area = (2 + 4/22)* side * side

Draw the UML diagram that involves Octagon, GeometricObject, Comparable, and Cloneable. Write a test program that creates an Octagon object with side value 5 and displays its area and perimeter. Create a new object using the clone method and compare the two objects using the compareTo method.

Explanation / Answer

import ToolKit.Octagon;
public class oct
{
public static void main(String[] args)
{
Octagon oc1 = new Octagon(10);
Octagon oc2 = (Octagon)oc1.clone();
System.out.println("compareTo: " + (oc1.compareTo(oc2) == 0));
System.out.println("equals: " + oc1.equals(oc2));
System.out.println("Have the same reference? " + (oc1 == oc2));
}
}

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