Main.java

public class Main {
    public static void main(String[] args) {
        Person andreas = new Person("Andreas");
        Werewolf w = new Werewolf(andreas);
        w.brain.think();
    }
}

class Person {
    String name;
    public Person(String name) {
        this.name = name;
    }

    public class Brain {
        public void think() {
            System.out.println(name + " is thinking");
        }
    }
}

class Werewolf {
    WerewolfBrain brain;
    public Werewolf(Person p) {
        brain = new WerewolfBrain();
    }

    class WerewolfBrain extends Person.Brain {
        WerewolfBrain() {
        }
    }
}