interface Animal{
     public void speak();
}

class Cat implements Animal{
     @Override
     public void speak(){
          System.out.println("Meow Meow");
     }
}

class Dog implements Animal{
     @Override
     public void speak(){
          System.out.println("Woof Woof");
     }
}

public class Main{
     public static void main(String [] args){
          Animal [] animals = {
               new Dog(),
               new Cat()
          };
          for(Animal animal : animals){
               animal.speak();
          }
     }
}