MulticlassDemo.java

class Circle
{
   
    double r;
    double circumference()
    {
        return 2*3.14*r;
    }
    double area()
    {
        return (22/7)*r*r;
    }
}
class Box
{
    double width;
    double height;
    double depth;
    double area()
    {
        double a;
        a=(width*height + height*depth + width*depth)*2;
        return a;
    }
    double volume()
    {
        double v;
        v=width*height*depth;
        return v;
    }

}
class MulticlassDemo
{
    public static void main(String args[])
    {
        Circle c= new Circle();
        Box b=new Box();
        c.r=5.0;
        b.width=3.0;b.height=4.0;b.depth=5.0;
        System.out.println("Circumference Circle: "+c.circumference());
        System.out.println("Area circle: "+c.area());
        System.out.println("Area of Box: "+b.area());
        System.out.println("Volume of Box: "+b.volume());
    }
}