Inheritance-Example

package tfortesting.com;

//This program uses inheritance to extend Box.
class Box {
 double width;
 double height;
 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;
 }
}

// Here, Box is extended to include weight.
class BoxWeight extends Box {
 double weight; // weight of box
 // constructor for BoxWeight

BoxWeight(double w, double h, double d, double m) {
 width = w;
 height = h;
 depth = d;
 weight = m;
 }
}

class DemoBoxWeight {
 public static void main(String args[]) {
 BoxWeight mybox1 = new BoxWeight(10, 20, 15, 34.3);
 BoxWeight mybox2 = new BoxWeight(2, 3, 4, 0.076);
 double vol;
 vol = mybox1.volume();
 System.out.println("Volume of mybox1 is " + vol);
 System.out.println("Weight of mybox1 is " + mybox1.weight);
 System.out.println();
 vol = mybox2.volume();
 System.out.println("Volume of mybox2 is " + vol);
 System.out.println("Weight of mybox2 is " + mybox2.weight);
 }
}

Output:

Volume of mybox1 is 3000.0
Weight of mybox1 is 34.3

Volume of mybox2 is 24.0
Weight of mybox2 is 0.076

Next Steps...

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