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;

}

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

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();

}

public class TestGeometricObject {

/** Main method */

public static void main(String[] args) {

// Declare and initialize two geometric objects

GeometricObject geoObject1 = new Circle(5);

GeometricObject geoObject2 = new Rectangle(5, 3);

System.out.println("The two objects have the same area? " +

equalArea(geoObject1, geoObject2));

// Display circle

displayGeometricObject(geoObject1);

// Display rectangle

displayGeometricObject(geoObject2);

}

/** A method for comparing the areas of two geometric objects */

public static boolean equalArea(GeometricObject object1,

GeometricObject object2) {

return object1.getArea() == object2.getArea();

}

/** A method for displaying a geometric object */

public static void displayGeometricObject(GeometricObject object) {

System.out.println();

System.out.println("The area is " + object.getArea());

System.out.println("The perimeter is " + object.getPerimeter());

}

}

Questions

1. Derive a MyCircle class and a MyRectangle class from GeometricObject and define all abstract methods in the derived classes

2. Use TestGeometricObject class to compare the area of any two GeometricObjects ( either both of type MyCircle, both MyRectangle or one of each type)

3. Now derive a MyTriangle class and repeat step 3 with MyTriangle Object and a MyCircle or MyRectangle

4. Overload the equalArea() method to accept three GeometricObjects as parameters and compare their areas

5. Make changes to the given code if necessary