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Inheritance

In Java, it is possible to inherit attributes and methods from one class to another. We group the "inheritance concept" into two categories:

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  • subclass (child) - the class that inherits from another class

  • superclass (parent) - the class being inherited from

 

To inherit from a class, use the extends keyword.

In the example below, the Car class (subclass) inherits the attributes and methods from the Vehicle class (superclass):

Capture.PNG
Capture.PNG
Capture.PNG

Polymorphism

Polymorphism means "many forms". 

Polymorphism refers to the ability of a class to provide different implementations of a method, depending on the type of object that is passed to the method. Polymorphism in Java allows us to perform the same action in many different ways. 

 

For example, think of a superclass called Animal that has a method called animalSound(). Subclasses of Animals could be Pigs, Cats, Dogs, Birds - And they also have their own implementation of an animal sound (the pig oinks, and the cat meows, etc.): 

CLICK THE IMAGE TO SEE THE CODE

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