interface Animal {

  public void animalSound(); // interface method (does not have a body)

  public void sleep(); // interface method (does not have a body)

}

​

class Pig implements Animal {

  public void animalSound() {

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

  }

  public void sleep() {

    System.out.println("Zzz");

  }

}

​

class Main {

  public static void main(String[] args) {

    Pig myPig = new Pig();

    myPig.animalSound();

    myPig.sleep();

  }

}

​