Question

Write a class named Octagon (Octagon.java) that extends the following abstract GeometricObject class 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 + "\ncolor: " + 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

Submit the UML diagram file OctagonUML.docx and all three source code files - GeometricObject.java, Octagon.java, and OctagonTest.java

Answer 1

//output

//copyable code

//driver.java

public class driver {

    

     public static void main(String[] args) throws CloneNotSupportedException {

          // object

          Octagon oc1 = new Octagon(5);

          // Display

          System.out.println("\nOctagon:\nArea: " + oc1.get_Area() +

              "\nPerimeter: " + oc1.get_Perimeter());

          // method

          //System.out.println("Cloning Octagon...");

          Octagon octagon2 = (Octagon)oc1.clone();

          // method

          int output = (oc1.compareTo(octagon2));

          if (output == 1)

              System.out.println("Octagon is higher than its clone.");

          else if (output == -1)

              System.out.println("Octagon is lower than its clone.");

          else

              System.out.println("Comparison result between an octagon and its clone: 0");

     }

}

// Octagon.java

public class Octagon extends Geometric_Object

          implements Cloneable, Comparable<Octagon> {

     private double side;

     public Octagon() {

     }

     /** Constructor */

     public Octagon(double side) {

          this.side = side;

     }

    

     public void setSide(double side) {

          this.side = side;

     }

    

     public double getSide() {

          return side;

     }

     @Override

     public double get_Area() {

          return (2 + 4 / Math.sqrt(2)) * side * side;

     }

     @Override

     public double get_Perimeter() {

          return 8 * side;

     }

     @Override

     public int compareTo(Octagon o) {

          if (get_Area() > o.get_Area())

              return 1;

          else if (get_Area() < o.get_Area())

              return -1;

          else

              return 0;

     }

     @Override

     public Object clone() throws CloneNotSupportedException {

          return super.clone();

     }

     @Override

     public String toString() {

          return super.toString() + "\nArea: " + get_Area() +

              "\nPerimeter: " + get_Perimeter();

     }

}

// Geometric_Object.java

public abstract class Geometric_Object {

     private String color = "while";

     private boolean fill;

     private java.util.Date date_Created;

     protected Geometric_Object() {

          date_Created = new java.util.Date();

     }

     protected Geometric_Object(String color, boolean fill) {

          date_Created = new java.util.Date();

          this.color = color;

          this.fill = fill;

     }

    

     public String get_Color() {

          return color;

     }

    

     public void set_Color(String color) {

          this.color = color;

     }

    

     public boolean isfill() {

          return fill;

     }

    

     public void setfill(boolean fill) {

          this.fill = fill;

     }

    

     public java.util.Date getdate_Created() {

          return date_Created;

     }

     @Override

     public String toString() {

          return "created on " + date_Created + "\ncolor: " + color +

              " and fill: " + fill;

     }

    

     public abstract double get_Area();

    

     public abstract double get_Perimeter();

}

//UML Diagram

Answer 2

//output

//copyable code

//driver.java

public class driver {

    

     public static void main(String[] args) throws CloneNotSupportedException {

          // object

          Octagon oc1 = new Octagon(5);

          // Display

          System.out.println("\nOctagon:\nArea: " + oc1.get_Area() +

              "\nPerimeter: " + oc1.get_Perimeter());

          // method

          //System.out.println("Cloning Octagon...");

          Octagon octagon2 = (Octagon)oc1.clone();

          // method

          int output = (oc1.compareTo(octagon2));

          if (output == 1)

              System.out.println("Octagon is higher than its clone.");

          else if (output == -1)

              System.out.println("Octagon is lower than its clone.");

          else

              System.out.println("Comparison result between an octagon and its clone: 0");

     }

}

// Octagon.java

public class Octagon extends Geometric_Object

          implements Cloneable, Comparable<Octagon> {

     private double side;

     public Octagon() {

     }

     /** Constructor */

     public Octagon(double side) {

          this.side = side;

     }

    

     public void setSide(double side) {

          this.side = side;

     }

    

     public double getSide() {

          return side;

     }

     @Override

     public double get_Area() {

          return (2 + 4 / Math.sqrt(2)) * side * side;

     }

     @Override

     public double get_Perimeter() {

          return 8 * side;

     }

     @Override

     public int compareTo(Octagon o) {

          if (get_Area() > o.get_Area())

              return 1;

          else if (get_Area() < o.get_Area())

              return -1;

          else

              return 0;

     }

     @Override

     public Object clone() throws CloneNotSupportedException {

          return super.clone();

     }

     @Override

     public String toString() {

          return super.toString() + "\nArea: " + get_Area() +

              "\nPerimeter: " + get_Perimeter();

     }

}

// Geometric_Object.java

public abstract class Geometric_Object {

     private String color = "while";

     private boolean fill;

     private java.util.Date date_Created;

     protected Geometric_Object() {

          date_Created = new java.util.Date();

     }

     protected Geometric_Object(String color, boolean fill) {

          date_Created = new java.util.Date();

          this.color = color;

          this.fill = fill;

     }

    

     public String get_Color() {

          return color;

     }

    

     public void set_Color(String color) {

          this.color = color;

     }

    

     public boolean isfill() {

          return fill;

     }

    

     public void setfill(boolean fill) {

          this.fill = fill;

     }

    

     public java.util.Date getdate_Created() {

          return date_Created;

     }

     @Override

     public String toString() {

          return "created on " + date_Created + "\ncolor: " + color +

              " and fill: " + fill;

     }

    

     public abstract double get_Area();

    

     public abstract double get_Perimeter();

}

//UML Diagram