Java Program For Implementing Multilevel Inheritance

class Box { private double width; private double height; private double depth; // construct clone of an object Box(Box ob) { // pass object to constructor width = ob.width; height = ob.height; depth = ob.depth; } // constructor used when all dimensions specified Box(double w, double h, double d) { width = w; height = h; depth = d; } // constructor used when no dimensions specified Box() { width = -1; // use -1 to indicate height = -1; // an uninitialized depth = -1; // box } // constructor used when cube is created Box(double len) { width = height = depth = len; } // compute and return volume double volume() { return width * height * depth; } } // Add weight. class BoxWeight extends Box { double weight; // weight of box // construct clone of an object BoxWeight(BoxWeight ob) { // pass object to constructor super(ob); weight = ob.weight; } // constructor when all parameters are specified BoxWeight(double w, double h, double d, double m) { super(w, h, d); // call superclass constructor weight = m; } // default constructor BoxWeight() { super(); weight = -1; } // constructor used when cube is created BoxWeight(double len, double m) { super(len); weight = m; } } // Add shipping costs class Shipment extends BoxWeight { double cost; // construct clone of an object Shipment(Shipment ob) { // pass object to constructor super(ob); cost = ob.cost; } // constructor when all parameters are specified Shipment(double w, double h, double d,double m, double c) { super(w, h, d, m); // call superclass constructor cost = c; } // default constructor Shipment() { super(); cost = -1; } // constructor used when cube is created Shipment(double len, double m, double c) { super(len, m); cost = c; } } class DemoShipment { public static void main(String args[]) { Shipment shipment1 =new Shipment(10, 20, 15, 10, 3.41); Shipment shipment2 = new Shipment(2, 3, 4, 0.76, 1.28); double vol; vol = shipment1.volume(); System.out.println("Volume of shipment1 is " + vol); System.out.println("Weight of shipment1 is "+ shipment1.weight); System.out.println("Shipping cost: $" + shipment1.cost); System.out.println(); vol = shipment2.volume(); System.out.println("Volume of shipment2 is " + vol); System.out.println("Weight of shipment2 is "+ shipment2.weight); System.out.println("Shipping cost: $" + shipment2.cost); } }