Question

Can the folllowing be done in Java, can code for all classes and code for the interface be shown please.

Modify the GeometricObject class to implement the Comparable interface and define a static max method in the GeometriObject class for finding the larger of two GeometricObject objects. Write a test program that uses the max method to find the larger of two circles, the larger of two rectangles. The GeometricObject class is provided below:

public abstract class GeometricObject {
  private String color = "white";
  private boolean filled;
  private java.util.Date dateCreated;
  protected GeometricObject() {
    dateCreated = new java.util.Date();
  }
  protected GeometricObject(String color, boolean filled) {
    dateCreated = new java.util.Date();
    this.color = color;
    this.filled = filled;
  }
  public String getColor() {   return color;  }
  public void setColor(String color) {  this.color = color;  }
  public boolean isFilled() {   return filled;  }
  public void setFilled(boolean filled) {  this.filled = filled;  }
  public java.util.Date getDateCreated() {   return dateCreated;  }
  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();
}

Answer 1

GeometricObject.java

public abstract class GeometricObject<E> implements Comparable<E> {

private String color = "white";

private boolean filled;

private java.util.Date dateCreated;

/** Construct a default geometric object */

public GeometricObject() {

dateCreated = new java.util.Date();

}

/** Construct a geometric object with the specified color

* and filled value */

public 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,

its 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;

}

/** Return a string representation of this object */

public String toString() {

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

" and filled: " + filled;

}

/** Abstract Method to get the Area of the Geometric Object */

public abstract double getArea();

public abstract double getPerimeter();

/** Static Method to find the Larger among two Same Kind of Geometric Object*/

public static <T extends GeometricObject> T max(T obj1, T obj2){

if(obj1.getArea() > obj2.getArea()){

return obj1;

}else if(obj1.getArea() == obj2.getArea()){

return null; // Return null if both the objects are of same size

}else{

return obj2;

}

}

}

____________________

Circle.java

public class Circle extends GeometricObject<Circle> {

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;

}

/** Return area */

public double getArea() {

return radius * radius * Math.PI;

}

/** Return diameter */

public double getDiameter() {

return 2.0 * radius;

}

/** Return perimeter */

public double getPerimeter() {

return 2.0 * radius * Math.PI;

}

/* Print the circle info */

public void printCircle() {

System.out.println("The circle is created " + getDateCreated() +

" and the radius is " + radius);

}

@Override

public int compareTo(Circle circle){

if(this.radius == circle.getRadius()){

return 0;

}else if(this.radius > circle.getRadius()){

return 1;

}else{

return -1;

}

}

}

__________________

Rectangle.java

public class Rectangle extends GeometricObject<Rectangle> {

private double width;

private double height;

public Rectangle() {

}

public Rectangle(double width, double height) {

this.width = width;

this.height = height;

}

public Rectangle(double width, double height, String color,

boolean filled) {

this.width = width;

this.height = height;

setColor(color);

setFilled(filled);

}

/** Return width */

public double getWidth() {

return width;

}

/** Set a new width */

public void setWidth(double width) {

this.width = width;

}

/** Return height */

public double getHeight() {

return height;

}

/** Set a new height */

public void setHeight(double height) {

this.height = height;

}

/** Return area */

public double getArea() {

return width * height;

}

/** Return perimeter */

public double getPerimeter() {

return 2 * (width + height);

}

@Override

public int compareTo(Rectangle rectangle){

if(getArea() == rectangle.getArea()){

return 0;

}else if(getArea() > rectangle.getArea()){

return 1;

}else{

return -1;

}

}

}

_________________

Test.java

public class Test {

public static void main(String[] args) {

  

Circle circle1 = new Circle(10.0);

Circle circle2 = new Circle(5.0);

Circle largerCircle;

Rectangle rectangle1 = new Rectangle(3.0, 4.0);

Rectangle rectangle2 = new Rectangle(4.0, 2.0);

Rectangle largerRectangle;

System.out.println("Two Circles circle1 and circle2 with radius 10.0 and 5.0 respectively");

largerCircle = GeometricObject.max(circle1, circle2);

System.out.println("The larger among the two circle is the one with radius : " + largerCircle.getRadius());

System.out.println(

"Two Rectangles rectangle1 and rectangle2 with (width, height) (3.0,4.0) and (4.0,2.0) respectively");

largerRectangle = GeometricObject.max(rectangle1, rectangle2);

System.out.println("The larger among the two rectangle is the one with (width, height) : ("

+ largerRectangle.getWidth() + "," + largerRectangle.getHeight() + ")");

}

}

__________________

Output:

Two Circles circle1 and circle2 with radius 10.0 and 5.0 respectively
The larger among the two circle is the one with radius : 10.0
Two Rectangles rectangle1 and rectangle2 with (width, height) (3.0,4.0) and (4.0,2.0) respectively
The larger among the two rectangle is the one with (width, height) : (3.0,4.0)

______________Thank You