private static void CreateHumanTest()
        {
            AbstractHumanFactory yinyanglu = new HumanFactory();
            Human whiteHuman = yinyanglu.createHuman <WhiteHuman>();

            whiteHuman.getColor();
            whiteHuman.talk();

            Human blackHuman = yinyanglu.createHuman <BlackHuman>();

            blackHuman.getColor();
            blackHuman.talk();

            Human yellowHuman = yinyanglu.createHuman <YellowHuman>();

            yellowHuman.getColor();
            yellowHuman.talk();

            //注意:yinyanglu已经限制为人Human及子类型,TestDeleteClass普通类实例化会报错
            //yinyanglu.createHuman<TestDeleteClass>();
        }