Dog.java

package parrots;

public class Dog {

    private String name;

	public Dog(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public String sayHello() {
		return "Wuff! Wuff!";
	}

}

DogAdapter.java

package parrots;

public class DogAdapter extends Parrot {

    private Dog dog;
	
	public DogAdapter(Dog dog) {
		super(dog.getName());
		this.dog = dog;
	}
	
	public String sayHello() {
		return this.dog.sayHello();
	}
}

Parrot.java

package parrots;

public class Parrot {
    
	private String name;
	
	public Parrot(String name)
	{
		this.name = name;
	}
	
	public String sayHello() {
		return String.format("Hello master, my name is %s", this.name);
		
	}
}

ParrotDemo.java

package parrots;

import java.util.ArrayList;
import java.util.List;

public class ParrotDemo {

    public static void main(String[] args) {
		List<Parrot> parrots = new ArrayList<Parrot>();
		parrots.add(new Parrot("Charly"));
		parrots.add(new Parrot("Lorchen"));

		System.out.println("Hello, my parrots!");
		greetMaster(parrots);
		
		DogAdapter dog = new DogAdapter(new Dog("Spike"));
		parrots.add(dog);
		
		System.out.println("Hello, my pets!");
		greetMaster(parrots);
		
	}

	public static void greetMaster(List<Parrot> parrots) {
		for (Parrot parrot : parrots) {
			System.out.println(parrot.sayHello());
		}
		System.out.println();
	}

}

parrots.py

#!/usr/bin/env python3

class Parrot:

    def __init__(self, name):
        self.name = name
    
    def say_hello(self):
        return "Hello master, my name is {}".format(self.name)
        
        
class Dog:

    def __init__(self, name):
        self.name = name
        
    def say_hello(self):
        return "Wuff! Wuff!"
        

def greet_master(pets):
    print(*(pet.say_hello() for pet in pets), sep="\n")
    print()
        

def main():
    parrots = [Parrot("Charly"), Parrot("Lorchen")]
    print("Hello, my parrots!")
    greet_master(parrots)
    # Sinnvoller Weise würde man den Container umbenennen, aber es soll ja
    # nur demonstrieren, dass man einen Hund sehr wohl in einen Container
    # von Papageien stecken kann
    parrots.append(Dog("Spike"))
    print("Hello, my pets!")
    greet_master(parrots)


if __name__ == "__main__":
    main()