Inheritance

Inheritance is one of the feature of Object-Oriented Programming (OOPs). Inheritance allows a class to use the properties and methods of another class. In other words, the derived class inherits the states and behaviors from the base class. The derived class is also called subclass and the base class is also known as super-class. The derived class can add its own additional variables and methods. These additional variable and methods differentiates the derived class from the base class.

Example:

class Box { double width; double height; double depth; Box() { } Box(double w, double h, double d) { width = w; height = h; depth = d; } void getVolume() { System.out.println("Volume is : " + width * height * depth); } } public class MatchBox extends Box { double weight; MatchBox() { } MatchBox(double w, double h, double d, double m) { super(w, h, d); weight = m; } public static void main(String args[]) { MatchBox mb1 = new MatchBox(10, 10, 10, 10); mb1.getVolume(); System.out.println("width of MatchBox 1 is " + mb1.width); System.out.println("height of MatchBox 1 is " + mb1.height); System.out.println("depth of MatchBox 1 is " + mb1.depth); System.out.println("weight of MatchBox 1 is " + mb1.weight); } }

Output

Volume is : 1000.0
width of MatchBox 1 is 10.0
height of MatchBox 1 is 10.0
depth of MatchBox 1 is 10.0
weight of MatchBox 1 is 10.0