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W3schools - Inheritance

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Inheritance

Why and when to use Inheritance?

  • useful for code reusability!

It is possible to inherit attributes and methods from one class to anoter

Inheritance concept

  • subclass(child)

    the class that inherits from anoter class

  • superclass(parent)

    the class being inherited from

To inherit from a class use the “extends” keyword

class Vehicle{
	protected String brand = “Ford”;
	public void honk(){
		System.out.println(“Tuut,tuut!”);
	}
}
class Car extends Vehicle{
	private String modelName = “Mustang”;
	public static void main(String[] args){
		Car myCar = new Car();
		myCar.honk(); // call the method(from the Vehicle class)
						on the myCar object
		System.out.println(myCar.brand + “ ” + myCar.modelName);
	}
}

Polymorphism

Means “many forms”, and it occurs when we have many classes that are related to each other by inheritance

It uses methods to perform different task

This allows us to perform a single action in different ways

class Animal{
	public void animalSound(){
		System.out.println(“The animal makes a sound”);
	}
}
class Pig extends Animal{
	public void animalSound(){
		System.out.println(“The pig says : wee wee”);
	}
}
class Dog extends Animal{
	public void animalSound(){
		System.out.println(“The dog says : bow wow”);
	}
}
class Main{
	public static void main(String[] args){
		Animal myAnimal = new Animal();
		Animal myPig = new Pig();
		Animal myDog = new Dog();
	myAnimal.animalSound();
		myPig.animalSound();
		myDog.animalSound();
		}
	}