public static void main(String[] args) {
        // һߣ
        HumanFactory maleHumanFactory = new MaleHumanFactory();
        // ڶߣŮ
        HumanFactory femaleHumanFactory = new FemaleHumanFactory();
        // ߽ϣʼ:
        Human maleYellowHuman = maleHumanFactory.createYellowHuman();
        Human femaleYellowHuman = femaleHumanFactory.createYellowHuman();
        maleYellowHuman.cry();
        maleYellowHuman.laugh();
        femaleYellowHuman.sex();
        /*
         * ..... 
         */
    }