C# 热水器
2014-08-09 21:40 wuzhang 阅读(1548) 评论(1) 编辑 收藏 举报需求分析:现在有一个烧水器假设水温升高到100度为开水请用设计程序模拟整个烧水的过程,打开热水器,当水温达到95度时报警器开始发出警报,水温达到100度时,断开热水器电源。
我们使用常规的思维去分析这个需求,不就一个开关控制,一个警报吗?不假思索代码就好了,我们来看看下面的垃圾代码啊。
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Threading; namespace heater { class Program { static int tempture = 0; /// <summary> /// 开关 /// </summary> class Switcher { public void SwitchOn() { Console.WriteLine("热水器被打开"); } public void SwitchOff() { Console.WriteLine("热水器被关闭"); } } /// <summary> /// 热水器 /// </summary> class Heater { public void BoidWater() { int i = 0; for (i = 0; i <= 100; i++) { tempture = i; Thread.Sleep(1000 / (i + 1)); if (tempture < 95 && tempture % 10 == 0) { Console.WriteLine("烧水中..."); } else { MakeAlerm(tempture); ShowTempture(tempture); } } } public static void MakeAlerm(int tem) { if (tem > 95) { Console.WriteLine("报警器:“嘀嘀嘀,水快烧开了.....”"); } } private static void ShowTempture(int tempture) { if (tempture > 95) { if (tempture == 100) { Console.WriteLine("\n水真的开了\n"); } else { Console.WriteLine("水的温度是:{0}\n", tempture); } } } } static void Main(string[] args) { Heater heater = new Heater(); Switcher switcher = new Switcher(); switcher.SwitchOn(); heater.BoidWater(); switcher.SwitchOff(); Console.ReadLine(); } } }
不信你就看截图:应该还满足需求吧.
这样写我根本就没动脑子,说实话连垃圾都不如,没一点价值,完全以一个码农去完成了。现在我们换个思维去思考,设计模式中是不是有一种叫做观察者模式的,我们可不可以借助观察者模式去试下呢?既然是观察者模式肯定有像观察者一样的对象,我感觉此处的观察者就是热水器,它实时监控着水温,而水温是其他事件的触发者,下面我们看看这次写的代码:
observer.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Threading; namespace oberver { //开关 public class Switch { public void SwitchOn(int tempture) { if (tempture <= 0) { Console.WriteLine("热水器被打开"); } } public void Switchoff(int tempture) { if (tempture >= 100) { Console.WriteLine("热水器被关闭"); } } } //热水器 public class Heater { private int tempture; public delegate void BoildHander(int param); //声明委托 public event BoildHander BoilEvent; //声明事件 //烧水 public void BoilWater() { if (BoilEvent != null) { BoilEvent(tempture); } for (int i = 0; i <= 100; i++) { tempture = i; Thread.Sleep(1000 / (i + 1)); if (i % 10 == 0 && i<100) { Console.WriteLine("烧水中..."); } //Console.WriteLine("烧水中,温度:{0}'",tempture); if (tempture > 95) { if (BoilEvent != null) //如果有注册事件 { BoilEvent(tempture);//调用所有注册时间的方法 } } } } } //警报器 public class Alarm { public void MakeAlert(int tempture) { if (tempture >= 96) { Console.WriteLine("嘀嘀嘀,水已经{0}度了\n", tempture); } } } //显示器 public class Display { public static void ShowMsg(int tem) { if (tem == 100) { Console.WriteLine("水烧开了,当前温度是:{0}度\n", tem); } } } class Progrm { static void Main(string[] args) { Switch switcher = new Switch();
Heater heater = new Heater(); Alarm alarm = new Alarm(); heater.BoilEvent += switcher.SwitchOn; //注册事件 heater.BoilEvent += alarm.MakeAlert; //注册事件 //heater.BoilEvent += (new Alarm()).MakeAlert; //匿名对象注册方法 heater.BoilEvent += Display.ShowMsg; //注册方法 heater.BoilEvent += switcher.Switchoff; heater.BoilWater(); //开始烧水 Console.Read(); } } }
此次运行结果:
同样的功能,不一样的代码,后者是不是有种高大上的感觉。