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Finally, the three println statements at the end print a text representation of each Automobile. Such use of an object s name, such as economy, inside println causes the JVM to use the toString() method of the class. When that happens here, the result on the screen is this: 3 Automobiles 2006 Kia Rio 2002 VW Passat 2005 Ford Mustang
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Inheritance OO programming makes it easy to add functionality to software without rewriting the code one has already written and tested. Suppose we want to add distinctions between types of Automobiles. A Ferrari can go much faster than a Kia, so the accelerate() method should be different, and perhaps other behaviors should also be different for such different Automobiles. We can add a new class called SportsCar that will inherit from Automobile, and we can give the SportsCar class a different accelerate() method. Here is the Java class for SportsCar: /** * Class SportsCar * Inherits from class Automobile * @author Carl Reynolds */ class SportsCar extends Automobile { private double maxSpeed = 150.; //constructor SportsCar( String mk, String mdl, int yr, int power ) { super( mk, mdl, yr, power ); } //override of inherited accelerate() method public void accelerate( double newSpeed ) { if( newSpeed > maxSpeed ) speed = maxSpeed; else speed = newSpeed; } } The SportsCar class extends the class Automobile; that means SportsCar inherits from Automobile. Any instance of a SportsCar will also be an Automobile, and except where there are differences between the code for SportsCar and the code for Automobile, an instance of a SportsCar will have exactly the same state variables and behavior as any instance of the class Automobile. The SportsCar class must also have a constructor; it s called SportsCar. The constructor for SportsCar simply uses the constructor for Automobile, the superclass, by using the super key word to pass the same values for make, model, year, and power to the constructor for the Automobile class. The only difference between instances of SportsCar and instances of Automobile will be the behavior provided by the accelerate() method. In the case of an Automobile, the maximum speed will be 70, but in the case of a SportsCar, the maximum speed will be 150. We say that the subclass SportsCar overrides the accelerate() method inherited from the superclass Automobile. Everything else that is true about an Automobile object will be true about a SportsCar object. All will have instance variables to store make, model, year, horsepower and speed. Creating either a new
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Automobile or a new SportsCar will increment the count of Automobiles maintained by the Automobile class. We didn t have to change any of our existing code to enhance our work to treat sports cars differently from other automobiles! POLYMORPHISM The word polymorphism means many forms. When a subclass overrides a method of a superior class, the behavior of the method will depend upon which type of object is being used in the program, an instance of the superior class or an instance of the subclass. This characteristic of OO programming is called polymorphism, and it is a powerful feature of the OO approach. We will add some lines to our AutomobileFactory class to set the speed of a family car to 120 and set the speed of a sports car to 120. Looking back at the accelerate() method for the class Automobile, you will see that the maximum speed for an instance of the Automobile class is 70. Compare that with the accelerate() method for the SportsCar class; the top speed for a SportsCar is 150. When we call the same accelerate() method for an instance of Automobile and an instance of SportsCar, the results are different. The Automobile speeds up to 70, and the SportsCar speeds up to 120. To show this, add code to the AutomobileFactory class: /** * Class AutomobileFactory * @author Carl Reynolds */ class AutomobileFactory { . . . family = new Automobile( "VW", "Passat", 2002, 170 ); sports = new SportsCar( "Ford", "Mustang", 2005, 300 ); . . . //same method call to instances of 2 different classes family.accelerate(120. ); sports.accelerate(120. ); //polymorphism will cause the effects to be different System.out.println( family + " " + family.getSpeed() ); System.out.println( sports + " " + sports.getSpeed() ); } This will be the new output: 3 Automobiles 2006 Kia Rio 2002 VW Passat 2005 Ford Mustang 2002 VW Passat 70.0 2005 Ford Mustang 120.0 Polymorphism allows us to write programs in a more general way. We can reference the superior class as we write programs, and if the object being used by the program happens to belong to a subclass of the superior
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