17-C#封装，继承，多态与重载

C#封装继承多态

1.

2.

3.多态

public abstract class animal//抽象类
{public abstract void eat();//抽象方法
}
public class cat : animal//继承
{public override void eat()//重写{messagebox.show("cat eat");}
}
public class dog: animal//继承
{public override void eat()//重写{messagebox.show("dog eat");}
}

4.重载

public class animal//抽象类
{public void eat(int a)//抽象方法{messagebox.show(a);}public void eat(int a,int b)//抽象方法{messagebox.show(a+b);}
}