class Box{

double width;

double depth;

double height;

Box(){

width=0;height=0;depth=0;

}

Box(double w,double h,double d){

width=w;depth=d;height = h;

}

double volume(){

return width*height*depth;

}

}

class BoxWeight extends Box{

double weight;

BoxWeight(double w,double h,double d,double m){

width=w;depth=d;height = h;weight=m;

}

}

public class DemoBoxWeight {

public static void main(String[] args) {

// TODO 自动生成的方法存根

BoxWeight mybox1=new BoxWeight(10,20,30,58.5);

BoxWeight mybox2=new BoxWeight(3,5,8,30.5);

System.out.println("Volume of mybox1 is "+mybox1.volume() );

System.out.println("Weight of mybox1 is "+mybox1.weight );

System.out.println("Volume of mybox2 is "+mybox2.volume() );

System.out.println("Volume of mybox2 is "+mybox2.weight);

}

}