/** 
 * AI: Francisco Lara-Dammer
 * Lab 9
 * Write two classes: Cube and Sphere with methods getArea, and getVolume.
 * Because these methods are common to both classes, it is a good idea
 * to write a third abstract class Solid. Test your code to calculate
 * the areas and volumes of a cube and sphere with parameters of your choice. 
*/

public abstract class Solid{
    
    
    double itsParameter;
    
    abstract double getArea();
    abstract double getVolume();
    
    public static void main(String args[]){

	//Testing for a cube of side x, and for a sphere of radius 10.
	Solid s1 = new Cube(10.0);
	Solid s2 = new Sphere(10.0);
       
	System.out.println("Area of a cube of side 10 = " + s1.getArea());
	System.out.println("Volume of a cube of side 10 = " + s1.getVolume());
	
	System.out.println("Area of a sphere of side 10 = " + s2.getArea());
	System.out.println("Volume of a sphere of side 10 = " + s2.getVolume());
    }
}



class Cube extends Solid{
    
    /**
     * Constructs a Cube. this.itsParameter is inherited from Solid
     */
    Cube(double itsParameter){
	this.itsParameter = itsParameter;
	
    }

    /**
     * Area of the cube = 6*x^2, where x is the length of its side. 
     */
    double getArea(){
	return 6*this.itsParameter*this.itsParameter;
    }
    
    /**
     * Volume of the cube = x^3. 
     */
    double getVolume(){
	return this.itsParameter*this.itsParameter*this.itsParameter;
    }
    
}


class Sphere extends Solid{
   
    static final double pi = Math.PI;
    
    /**
     * Constructs a Sphere. this.itsParameter is inherited from Solid
     */
    Sphere(double itsParameter){
	this.itsParameter = itsParameter;
	
    }

    /**
     * Area of the sphere = 4*pi*radius^2 
     */
    double getArea(){
	return 4*pi*itsParameter*itsParameter;
    }

    /**
     * Volume of the sphere = 4/3*pi*radius^3
     */
    double getVolume(){
	return 4/3.0*pi*itsParameter*itsParameter*itsParameter;
	
    }

}