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30_AbstractKeyword.java
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48 lines (36 loc) · 1.02 KB
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/**
*
* 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.
* */