JavaDI

package cz.azathoth;

public class Main {

    public static void main(String[] args) {
        Rabbits rabbits = new Rabbits();
        Foxes foxes = new Foxes();
        Positions positions = new Positions(rabbits, foxes);
        WorldFactory factory = new WorldFactory(rabbits, foxes);
    }
}

public class Foxes {

}

public class Rabbits {

}

public class Positions {

    private Rabbits rabbits;
    private Foxes foxes;

    public Positions(Rabbits rabbits, Foxes foxes) {
        this.rabbits = rabbits;
        this.foxes = foxes;
    }
}

public class WorldFactory {

    private Rabbits rabbits;
    private Foxes foxes;

    public WorldFactory(Rabbits rabbits, Foxes foxes) {
        this.rabbits = rabbits;
        this.foxes = foxes;
    }
}