// Abstract class

abstract class Animal {

  // Abstract method (does not have a body)

  public abstract void animalSound();

  // Regular method

  public void sleep() {

    System.out.println("Zzz");

  }

}

​

// Subclass (inherit from Animal)

class Pig extends Animal {

  public void animalSound() {

    // The body of animalSound() is provided here

    System.out.println("The pig says: wee wee");

  }

}

​

class Main {

  public static void main(String[] args) {

    Pig myPig = new Pig(); // Create a Pig object

    myPig.animalSound();

    myPig.sleep();

  }

}

​