C# - protected

1. 只有該 class 的區塊才能存取 private 的資源，就算是衍生的類別也算是外部

//base class
 class Monster
    {
        private int hp = 100;

        public int getHp()
        {
            return hp;
        }
    }

protected 關鍵字

用來控管不想讓外部隨意使用，但又想讓繼承的 class 內能存取的資源

  private void button1_Click(object sender, EventArgs e)
        {
            Monster mon = new Monster();
            Slim slim = new Slim();
            MessageBox.Show(""+slim.say());
        }

//base class
 class Monster
    {
        //private int hp = 100;
        protected int hp = 100;
        public int getHp()
        {
            return hp;
        }
        protected string introduceSelf()
        {
            return "I am monster";
        }
    }
//derivated class
class Slim:Monster
    {

        public Slim()
        {
            hp = 500;
        }
        public string say()
        {
            return "I am slim";
        }
          public string say()
        {
            return introduceSelf()+"I am slim";
        }
    }

開放程度

public > protected > private