برنامج Java لتوضيح طريقة بدون Parameters وبنوع Return

class Box 

{

    double width;

    double height;

    double depth;

    double volume() 

    {

        Scanner s = new Scanner(System.in);

        System.out.print("enter width : ");

        double width = s.nextDouble();

        System.out.print("enter height : ");

        double height = s.nextDouble();

        System.out.print("enter depth: ");

        double depth = s.nextDouble();

        return width * height * depth;

    }

}

class ReturnDemo 

{

    public static void main(String args[]) 

    {

        Box cuboid = new Box();

        double vol;

	vol = cuboid.volume();

        System.out.println("Volume is " + vol);

    }

}