c#经典面试题：猫叫，主人醒，老鼠跑

实现方法：分3个类实现，分别为猫类，老鼠类，主人类。

猫类：定义一个猫叫事件；

老鼠类：订阅猫叫事件，在猫发出叫声这个事件后，老鼠逃跑；

主人类：类似于老鼠类，在猫发出叫声这个事件后，主人醒来；

猫类实现如下：

namespace CarCry
{
    /// <summary>
    /// 猫类的定义
    /// </summary>
    public class Cat
    {
        //猫名
        private string _name;
        //猫叫事件
        public event EventHandler<CatCryEventArgs> CatCryEvent;
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="name">名字参数</param>
        public Cat(string name)
        {
            _name = name;
        }

        /// <summary>
        /// 促发猫叫的事件
        /// </summary>
        public void CatCry()
        {
            CatCryEventArgs args = new CatCryEventArgs(_name);
            Console.WriteLine(args);
            CatCryEvent(this, args);
        }
    }

    /// <summary>
    ///   猫叫事件参数
    /// </summary>
    public class CatCryEventArgs : EventArgs
    {
        //发出叫声的猫的名字
        private string _catname;
        /// <summary>
        /// 构造函数
        /// </summary>
        public CatCryEventArgs(string catname)
            : base()
        {
            _catname = catname;
        }

        /// <summary>
        ///   输出参数内容
        /// </summary>
        public override string ToString()
        {
            return "猫 " + _catname + " 叫了";
        }
    }
}

老鼠类的实现如下：

namespace CarCry
{
    public class Mouse
    {
        //老鼠名字
        private string _name;
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="name">老鼠的名字</param>
        /// <param name="cat">发出叫声的猫</param>
        public Mouse(string name, Cat cat)
        {
            _name = name;
            cat.CatCryEvent += CatCryHandle;//订阅猫叫事件
        }

        /// <summary>
        /// 猫叫事件处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="args"></param>
        private void CatCryHandle(object sender, CatCryEventArgs args)
        {
            Run();
        }

        /// <summary>
        /// 逃跑方法
        /// </summary>
        private void Run()
        {
            Console.WriteLine("老鼠 " + _name + " 逃跑了");
        }
    }
}

主人类的实现如下：

namespace CarCry
{
    public class Master
    {
        //主人名字
        private string _name;

        /// <summary>
        /// 构造函数，订阅事件
        /// </summary>
        /// <param name="name">主人名字</param>
        /// <param name="cat">猫</param>
        public Master(string name, Cat cat)
        {
            _name = name;
            cat.CatCryEvent += CatCryHandler;//订阅猫叫事件
        }

        /// <summary>
        /// 猫叫事件处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="args">猫叫事件</param>
        private void CatCryHandler(object sender, CatCryEventArgs args)
        {
            WakeUp();
        }

        /// <summary>
        /// 主人醒了事件
        /// </summary>
        private void WakeUp()
        {
            Console.WriteLine("主人 " + _name + " 醒了");
        }
    }
}

主函数的调用如下：

namespace CarCry
{
    class MainClass
    {
        static void Main(string[] args)
        {
            Console.WriteLine("开始模拟");
            Cat cat = new Cat("Tom");
            Mouse mouse1 = new Mouse("Jack", cat);
            Mouse mouse2 = new Mouse("jackson", cat);
            Master master = new Master("Tao", cat);
            Master master2 = new Master("Hong", cat);
            cat.CatCry();
            Console.ReadLine();
        }
    }
}