C#面向对象基础(六) 继承

最新推荐文章于 2025-05-31 15:51:09 发布

转载最新推荐文章于 2025-05-31 15:51:09 发布 · 63 阅读

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原文链接：http://www.cnblogs.com/imxh/archive/2011/09/08/2171506.html

本文详细阐述了C#中继承的概念，通过实例展示了如何在类Animal的基础上派生出狼类Wolf和山羊类Goat，同时介绍了访问控制修饰符、密封类以及构造方法的应用。此外，还探讨了继承带来的好处及潜在的设计问题。

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继承

描述的是 is a kind of 的关系.

比如:Animal类 wolf类. Wolf类是Animal类的子类,Animal类是父类.Wolf类从Animal类派生,Wolf类继承了Animal类

Wolf是一种Animal.

失败的设计:

1  public class Wolf
2     {
3         public string name;
4         public int age;
5         public bool ishungry;
6         private int weight;
7         public void Sleep()
8         {
9             Console.WriteLine("睡觉...");
10         }
11         public void Eat()
12         {
13             Console.WriteLine("吃羊...");
14         }
15     }
16     public class Goat
17     {
18         public string name;
19         public int age;
20         public bool ishungry;
21         private int weight;
22         public void Sleep()
23         {
24             Console.WriteLine("睡觉...");
25         }
26         public void Eat()
27         {
28             Console.WriteLine("吃草...");
29         }
30     }

用到了继承很好的设计!

class Animal
    {
        public string name;
        public int age;
        public bool ishungry;
        private int weight;
        public void Sleep()
        {
            Console.WriteLine("睡觉...");
        }
    }
    public class Wolf : Animal
    {
        public void Eat()
        {
            Console.WriteLine("吃羊...");
        }
    }
    public class Goat : Animal
    {
        public void Eat()
        {
            Console.WriteLine("吃草...");
        }
    }

访问控制修饰符

public 公开的,谁想访问都可以.

private 私有的,类内部访问

proteced 受保护的,子类可以访问.

默认private

密封类

sealed!

public class Animal
    {
        public string name;
        public int age;
        public bool ishungry;
        protected int weight;

        public Animal(string n,int a)
        {
            name = n;
            age = a;
            Console.WriteLine("Animal构造方法");
        }
        public void Sleep()
        {
            Console.WriteLine("睡觉...");
        }
    }
    public class Wolf : Animal
    {
        public Wolf():base("noname",1)
        { }
        public Wolf(string n):base(n,1)
        {
        }
        public Wolf(string n, int a):base(n,a)
        {
            Console.WriteLine("Wolf构造方法");
        }
        public new void Sleep()
        {
            Console.WriteLine("Wolf睡觉...");
        }
        public void Eat()
        {
            Console.WriteLine("吃羊...");
            base.Sleep();
        }
    }

转载于:https://www.cnblogs.com/imxh/archive/2011/09/08/2171506.html