attack_calculator.java

    public static int calculateDamageForDice(Character atk, Character def, int dice)
    {
        boolean hits = def.getArmorClass() < atk.getForce() + dice;
        if (hits && dice != 1)
        {
            int modifier = dice == 20 ? 2 : 1;
            return atk.getWeaponDamage() * modifier;
        }
        else
        {
            return 0;
        }
    }