Java program to create an interface and implement it in a class.

Below code  is used to create an interface and implement it in a class:

import java.io.*;
import java.util.Scanner;

interface Shape  
{
      final static double pi=3.142;
      public void area(float r);
}
class Circle implements Shape
{
      float area_circle;
      public void area(float r)
      {
            area_circle=(float)pi*r*r;
            System.out.println("area is :"+area_circle);
      }
            public static void main(String[] args)
            throws IOException
      {
            Circle c=new Circle();
            float radius;
            Scanner s=new Scanner(System.in);
            System.out.println("Enter the radius");
            radius=s.nextInt();
            c.area(radius);
      }
}
Thank You.

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