/**

*

* Abstract Class and Abstract Methods

* */

public class Main {

public static void main(String[] args) {

// new Animal(); // Not Allowed. Cannot create objects of abstract class.

Animal animal; // Allowed. You can create reference of abstract class.

Animal animal1 = new Dog(); // Parent class reference --> Child class object

animal1.eat();

animal1.run();

}

}

abstract class Animal {

public void run() {

System.out.println("Animal is running");

}

abstract public void eat();

}

class Dog extends Animal {

@Override

public void eat() {

System.out.println("Dog is eating");

}

}

/*

* Rules for abstract keyword:

* 1. abstract class:

* * A class that is declared abstract

* * You cannot create object of abstract class

* * It may or may not contain abstract methods

*

* 2. abstract method:

* * No method body. You cannot write code in abstract method.

* * It is mandatory to override the abstract method in child class.

* */