Design an interface named Colorable with a void method named how To Color (). Ev

Question

Design an interface named Colorable with a void method named how To Color (). Every class of a colorable object must implement the Colorable interface. Design a class named Square that extends Geometric Object and implements Colorable. Implement how To Color () to display the message Color all four sides. Write a test program that creates an array of five Geometric Objects. (new Square(2), new Circle(5), new Square(5), new Rectangle(3, 4), new Square(4.5)) For each object in the array, display its area and invoke it's how To Color () method if it is colorable. Area is 4.00 Color all four sides Area is 78.54 Area is 25.00 Color all four sides Area is 12.00 Area is 20.25 Color all four sides

Explanation / Answer

Colorable.java

public interface Colorable {
   String howToColor();
}

________________

GeometricObject.java

public abstract class GeometricObject {
public abstract double area();
}

__________________

Square.java

public class Square extends GeometricObject implements Colorable {

   double side;
  
   public Square(double side) {
       super();
       this.side = side;
   }

   @Override
   public String howToColor() {
       return "Color All four sides";

   }
public double area()
{
   return side*side;
  
}

}

________________

Rectangle.java

public class Rectangle extends GeometricObject {

   private double length;
   private double width;

   public Rectangle(double length, double width) {
       super();
       this.length = length;
       this.width = width;
   }

   public double area() {
       return length * width;
   }

}

_______________

Circle.java

public class Circle extends GeometricObject {

   private double radius;

   public Circle(double radius) {
       super();
       this.radius = radius;
   }

   public double area() {
       return Math.PI * radius * radius;
   }

}

________________

Test.java

public class Test {

   public static void main(String[] args) {
       GeometricObject[] go={new Square(2), new Circle(5), new Square(5), new Rectangle(3, 4),new Square(4.5)};
      
       for(int i=0;i<go.length;i++)
       {
           System.out.printf(" Area is %.2f ",go[i].area());
           if(go[i] instanceof Colorable)
               System.out.println(((Colorable)go[i]).howToColor()+" ");
       }
      

   }

}

_________________

Output:

Area is 4.00
Color All four sides

Area is 78.54

Area is 25.00
Color All four sides

Area is 12.00

Area is 20.25
Color All four sides

____________Thank You

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