What is inheritance in java explain with example, JAVA Programming

What is Inheritance in java Explain with example?

Code reusability is claimed to be a key advantage of object-oriented languages over non-object-oriented languages. Inheritance is the mechanism through that this is achieved. An object can inherit the variables and techniques of another object. It can remain those it wants, and replace those it doesn't need.

For instance, let us also expand the Car class so that a car also has a make, a model, a year, a number of passengers it can carry, four wheels, either two or four doors. That class might look like this:
public class Car {

private String licensePlate; // e.g. "New York A456 324"
private double speed; // kilometers per hour
private double maxSpeed; // kilometers per hour
private String make; // e.g. "Ford"
private String model; // e.g. "Taurus"
private int year; // e.g. 1997, 1998, 1999, 2000, 2001, etc.
private int numberPassengers; // e.g. 4
private int numberWheels = 4; // all cars have four wheels
private int numberDoors; // e.g. 4

// constructors
public Car(String licensePlate, double maxSpeed,
String make, String model, int year, int numberOfPassengers,
int numberOfDoors) {

this(licensePlate, 0.0, maxSpeed, make, model, year,
numberOfPassengers, numberOfDoors);


public Car(String licensePlate, double speed, double maxSpeed,
String make, String model, int year, int numberOfPassengers) {

this(licensePlate, speed, maxSpeed, make, model, year,
numberOfPassengers, 4);

public Car(String licensePlate, double speed, double maxSpeed,
String make, String model, int year, int numberOfPassengers,
int numberOfDoors) {

// I could add some more constraints like the
// number of doors being positive but I won't
// so that this example doesn't get too big.
this.licensePlate = licensePlate;
this.make = make;
this.model = model;
this.year = year;
this.numberPassengers = numberOfPassengers;
this.numberDoors = numberOfDoors;

if (maxSpeed >= 0.0) {
this.maxSpeed = maxSpeed;
else {
maxSpeed = 0.0;

if (speed < 0.0) {
speed = 0.0;

if (speed <= maxSpeed) {
this.speed = speed;
else {
this.speed = maxSpeed;

// getter (accessor) methods
public String getLicensePlate() {
return this.licensePlate;

public String getMake() {
return this.make;

public String getModel() {
return this.model;

public int getYear() {
return this.year;

public int getNumberOfPassengers() {
return this.numberPassengers;

public int getNumberOfWheels() {
return this.numberWheels;

public int getNumberOfDoors() {
return this.numberDoors;

public double getMaxSpeed() {
return this.maxSpeed;

public double getSpeed() {
return this.speed;

// setter method for the license plate property
public void setLicensePlate(String licensePlate) {
this.licensePlate = licensePlate;

// accelerate to maximum speed
// put the pedal to the metal
public void floorIt() {
this.speed = this.maxSpeed;

public void accelerate(double deltaV) {

this.speed = this.speed + deltaV;
if (this.speed > this.maxSpeed) {
this.speed = this.maxSpeed;
if (this.speed < 0.0) {
this.speed = 0.0;
Obviously this doesn't exhaust everything there is to say about a car. Which properties you choose to involves in your class depends on your application. 

Posted Date: 5/15/2013 6:14:54 AM | Location : United States

Related Discussions:- What is inheritance in java explain with example, Assignment Help, Ask Question on What is inheritance in java explain with example, Get Answer, Expert's Help, What is inheritance in java explain with example Discussions

Write discussion on What is inheritance in java explain with example
Your posts are moderated
Related Questions
It helps to resolve naming conflicts when different packages have classes with the same names. This also helps you prepare files within your project. As define : java.io package

how can i create an E-exam application on netbeans

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

Struts framework is an open-source framework for producing the web applications in Java EE, based on MVC-2 architecture. It uses and extends the Java Servlet API. Struts are robust

Coarse Grained SOA : Services are also could be coarse grained. E.g:   You may have a purchase element with individual functions to make a purchase order, add line items, and a

For this assignment we will be solving the producer-consumer problem with a bounded buffer. You are required to implement this assignment in Java. There are three components in thi

Write JavaScript code that is executed during form submission to calculate the cost of each book (based on quantity specified) and the overall total cost. The results should be dis

Explain the char data type in java? A char is a single character in which a letter, a digit, a punctuation mark, a tab, a space or something same. A char literal is a single on

Describe the final keyword ? The final keyword is used in various different contexts as a modifier meaning in which what it modifies cannot be changed in a few sense. final c

Printing Calculator Canvas Printing Calculator In this assignment we will continue to work on our canvas printing web service. Specifically we will make use of Javascrip