ABSTRACTION IN JAVA

 

Abstract class in Java

A class which is declared with the abstract keyword is known as an abstract class in java. It can have abstract and non-abstract methods (method with the body).

Abstraction in Java

Abstraction is a process of hiding the implementation details and showing only functionality to the user.

Points

• An abstract class must be declared with an abstract keyword.
• It can have abstract and non-abstract methods.
• It cannot be instantiated.
• It can have constructe and static methods also.
• It can have final methods which will force the subclass not to change the body of the method.

Abstract Method in Java

A method which is declared as abstract and does not have implementation is known as an abstract method.

abstract void print(); //no method body and abstract

eg -

// Abstract class

abstract class Animal {

  // Abstract method 

  public abstract void animalSound();

  // Regular method

  public void eat() {

    System.out.println("the dog eat");

  }

}

// Subclass (inherit from Animal)

class Dog extends Animal {

  public void animalSound() {

    

    System.out.println("The Dog sound");

  }

}

class Main {

  public static void main(String[] args) {

    Dog myDog = new Dog(); 

    myDog .animalSound();

    myDog .eat();

  }

}