Przekazanie wyniku funkcji do zmiennej

public class Battle {

    ICreature firstWarrior;
    ICreature secondWarrior;

    public Battle(ICreature firstWarrior, ICreature secondWarrior) {
        this.firstWarrior = firstWarrior;
        this.secondWarrior = secondWarrior;
    }

    public ICreature whoFirst(Battle battle) {

        if(battle.firstWarrior.getSpeed() > battle.secondWarrior.getSpeed()) {
            return battle.firstWarrior;
        } else {
            return battle.secondWarrior;
        }
    }

    ICreature wonWarrior; //= whoFirst(new Battle(this.firstWarrior, this.secondWarrior));

    public double hitPower() {
        return wonWarrior.getStrength();
    }

}

public class Killers {
    public static void main (String[] args) {
        ICreature cow = new Cow("Deniro");
        ICreature cat = new Cat("Puncio");

        Battle battle = new Battle(cow, cat);

        System.out.println("kto zaczyna: " + battle.whoFirst(battle).getName());

    }
}

    ICreature wonWarrior = whoFirst(new Battle(this.firstWarrior, this.secondWarrior));

ICreature wonWarrior = whoFirst(this);

public class Battle {

    ICreature firstWarrior;
    ICreature secondWarrior;
    ICreature wonWarrior;

    public Battle(ICreature firstWarrior, ICreature secondWarrior) {
        this.firstWarrior = firstWarrior;
        this.secondWarrior = secondWarrior;
        this.wonWarrior = whoFirst();
    }

    public ICreature whoFirst() {
        if(this.firstWarrior.getSpeed() > this.secondWarrior.getSpeed()) {
            return this.firstWarrior;
        } else {
            return this.secondWarrior;
        }
    }

    public double hitPower() {
        return wonWarrior.getStrength();
    }

}