Abstraction

• Hide certain details and show only what's necessary to the User
• Used through Abstract Classes/Interfaces
• Any class that inherits from an abstract class must implement all the abstract methods declared in the abstract class
• An abstract Class Cannot be instantiated

Example

public abstract class Animal{
    public abstract void animalSound();

    public void sleep(){
        System.out.println("Zzz");
    }
}

public class Dog extends Animal{
    public void animalSound(){
        System.out.println("Woofwoof");
    }
}

public class Base{
    public static void main(String [] args)
    {
        Dog olivia = new Dog();
        olivia.animalSound();
        olivia.sleep();
    }
}