What is inheritance in java explain with example, JAVA Programming

Assignment Help:

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. 


Related Discussions:- What is inheritance in java explain with example

Need basic ide with plug-ins, Need Basic IDE with Plug-ins Project Descr...

Need Basic IDE with Plug-ins Project Description: I am seeking someone to create me a Basic IDE that is able to install custom created plug-ins using Java. What I need you

Different types of messages available in the jms api, What are the differen...

What are the different types of messages available in the JMS API? Ans) Message, TextMessage, BytesMessage, StreamMessage, ObjectMessage, MapMessage are the dissimilar messages

Describe about the term access protection, Describe about the term Access P...

Describe about the term Access Protection ? Global variables are a typical cause of bugs in most programming languages. A few unknown function can modify the value of a variabl

Bluej, how to write a program to assign value of variable age and print if ...

how to write a program to assign value of variable age and print if person is major.

What do you understand by java virtual machine, Java Programming 1. Wha...

Java Programming 1. What do you understand by Java Virtual Machine? 2. Write a simple Java program to display a string message and explain the steps of compilation and execu

What are the non-final functions in java object class?, The non-final funct...

The non-final functions are clone (), finalize (), toString (), equals () , hashCode () and. The other methods like wait (), getClass (), notifyAll (), notify () etc are final

#The ArrayList class java, i want a full program with test about the follow...

i want a full program with test about the following: linkedComputers: We will assume that a number of methods are required. These are specified below. String getComputerName() ret

Android and universal ios- multipurpose testing app, Android and Universal ...

Android and Universal iOS, Multipurpose Testing App Universal iOS and Android, versatile Testing App Based on Phonegap with the subsequent main features * Support single answ

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd