A) Define an Interface Shape with abstract method area(). Write a java program to calculate an area of Circle and Sphere.(use final keyword)

 Slip 8 Q 1

Save code as             "InterfaceCircleSphere.java"

import java.util.Scanner;

interface Shape{

    void area();

}

class Circle implements Shape{

    final float PI=3.14f;

    float areacircle,radius;

    Scanner s=new Scanner(System.in);

    void accept(){

        System.out.print("Enter the Radius of circle : ");

        radius=s.nextFloat();

    }

    public void area(){

    areacircle=PI*radius*radius;

    }

    public void show()

    {

    System.out.println("Area of circle is : "+areacircle);

    }

}

class Sphere implements Shape{

    final float PI=3.14f;

    float areasphere,radius;

    Scanner s=new Scanner(System.in);

    void accept(){

        System.out.print("Enter the Radius of sphere : ");

        radius=s.nextFloat();

    }

    public void area(){

        areasphere=4*PI*radius*radius;

    }

    public void show(){

        System.out.println("Area of Sphere is : "+areasphere);

    }

}

class InterfaceCircleSphere

{

    public static void main(String args[]){

        Circle s1=new Circle();

        s1.accept();

        s1.area();

        s1.show();

        Sphere s2=new Sphere();

        s2.accept();

        s2.area();

        s2.show();

    }

}

OUTPUT: