I like the example so much , many thanks :) Yes we can see clearly how the car class can be used as many references.
Now i am wondering how these classes with its data represented in the memory ?? i mean parent class and child. Thanks Nada On Wed, Dec 23, 2009 at 12:11 AM, etudient.java <[email protected]>wrote: > The past two homeworks are examples of Polymorphism. > > taking from the JavaPassion page on Polymorphism, > > "Polymorphism is the ability to appear in many forms." > > "Subclasses of a class can define their own unique behaviors and yet > share some of the same functionality of the parent class." > > A CAR CAN APPEAR IN MANY FORMS, i.e models (Toyota,GMC,FORM,NISSAN etc). > > i.e you have a Car class > > public class Car{ > > int speed; > int numberOfDoors; > String modelBrand; > String countryOfManufacturer; > > public Car(int speed,int numberOfDoors,String modelBrand,String > countryOfManufacturer){ > this.speed = speed; > this.numberOfDoors = numberOfDoors; > this.modelBrand = modelBrand; > this.countryOfManufacturer = countryOfManufacturer; > > } > > //getter and setter methods below > > public String getModelBrand() { > return modelBrand; > } > > public void setModelBrand(String modelBrand) { > this.modelBrand = modelBrand; > } > > public int getNumberOfDoors() { > return numberOfDoors; > } > > public void setNumberOfDoors(int numberOfDoors) { > this.numberOfDoors = numberOfDoors; > } > > public int getSpeed() { > return speed; > } > > public void setSpeed(int speed) { > this.speed = speed; > } > > //WILL PRINT VARIABLE VALUES OF YOUR OBJECT > > public void print() { > > System.out.println("The name of your class = " + getClass()); > System.out.println("countryOfManufacturer = " + > getCountryOfManufacturer()); > System.out.println("modelBrand = " + getModelBrand()); > System.out.println("numberOfDoors = " + getNumberOfDoors()); > System.out.println("speed = " + getSpeed()); > > > } > > > } > > You can extend the Car class in classes Toyota,GMC,FORM,NISSAN etc. > > i.e, you have a Toyota class > > public class Toyota extends Car{ > > > > public Toyota(int speed,int numberOfDoors,String modelBrand,String > countryOfManufacturer){ > super(speed,numberOfDoors,"Camry","Japan");//For all Toyota objects the > modelBrand is "Camry", countryOfManufaturer is "Japan" > > } > > > > } > > > > Lets now look at the Main class that will instantiate a Toyota object. > > public class Main{ > > public static void main(String[] args){ > > Car toyota1 = new Toyota(200,4,"Yaris","China"); //"Yaris" > and "China" > will not be assigned to their respective variables > toyota1.print(); //will print values of toyota1 variables > > > } > } > > Output; > > The name of your class = class javaexample.Toyota > countryOfManufacturer = Japan > modelBrand = Camry > numberOfDoors = 4 > speed = 200 > > > > Why is this important; > > This is also good for encapsulating your code. > > See attachment for Files > > > > -- > To post to this group, send email to > [email protected] > To unsubscribe from this group, send email to > [email protected]<javaprogrammingwithpassion%[email protected]> > For more options, visit this group at > http://groups.google.com/group/javaprogrammingwithpassion?hl=en > -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/javaprogrammingwithpassion?hl=en
