Java program to calculate area and perimeter of circle using interfaces.

interface Shape {

    double calculateArea();

}

interface CircleProperties {

    double calculatePerimeter();

}

class Circle implements Shape, CircleProperties {

    private double radius;

    public Circle(double radius) {

        this.radius = radius;

    }

    public double calculateArea() {

        return Math.PI * radius * radius;

    }

    public double calculatePerimeter() {

        return 2 * Math.PI * radius;

    }

}

public class CircleCalculator {

    public static void main(String[] args) {

        Circle myCircle = new Circle(5.0);

        System.out.println("Area of the circle: " + myCircle.calculateArea());

        System.out.println("Perimeter of the circle: " + myCircle.calculatePerimeter());

    }

}