实验五 C#类的设计和实现,(2).doc

实验四 类的设计和实现（2）实验学时：2学时实验类型：验证实验要求：必做一、实验目的1. 掌握类的继承的实现；2. 掌握派生类、抽象类、抽象方法的使用；3. 了解接口的实现；4. 了解事件的实现二、实验内容实验1类的继承的实现实验要求：参照课本例8.3，创建基类Person和派生类Teacher。基类Person包含实例字段name和age；虚函数GetInfo（）显示个人信息。派生类Teacher除了包含基类的name和age字段，还包含自己的TeacherID字段，并使用关键字override来重写方法GetInfo（）。源程序：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication12 public class Person public string name; public uint age; public Person(string name, uint age) = name; this.age = age; public virtual void GetInfo() Console.WriteLine(Name:0, name); Console.WriteLine(Age:0, age); public class Teacher : Person public string TeacherID; public Teacher(string name, uint age, string id) : base(name, age) this.TeacherID = id; public override void GetInfo() base.GetInfo(); Console.WriteLine(TeacherID:0, TeacherID); class Program static void Main(string args) Teacher objteacher = new Teacher(Zhangying, 20, 1245713131); objteacher.GetInfo(); Console.ReadKey(); 运行结果：实验2 抽象类、抽象方法、多态性的实现实验要求：创建抽象基类Shape和派生类Rectangle、Circle。利用多态性实现Area（计算面积）和Show（显示图形名称和面积）抽象方法。源程序：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication13 public abstract class Shape private string m_id; public Shape(string s) Id= s; public string Id get return m_id; set m_id = value; public abstract double Area get; public override string ToString() return Id + Area= + string.Format(0:F2, Area); public class Rectangle : Shape private int m_width; private int m_height; public Rectangle(int width, int height, string id) : base(id) m_width = width; m_height = height; public override double Area get return m_height * m_width; public class Circle : Shape private int m_radius; public Circle(int radius, string id) : base(id) m_radius = radius; public override double Area get return m_radius * m_radius * System.Math.PI; class Program static void Main(string args) Shape shapes= new Circle (3,Circle # 1), new Rectangle(4,5,Rectangle # 1) ; Console.WriteLine(Shape Colection); foreach (Shape s in shapes) Console.WriteLine(s); Console.ReadKey(); 运行结果：实验3 接口的实现实验要求：声明一个接口ICDPlayer，包含4个接口方法：Play（）、Stop（）、NextTrack（）和PreviousTrack（），以及一个只读属性CurrentTrack创建类CDPlayer实现该接口，模拟CD的播放、停止、下一音轨、上一音轨的操作。（如何实现自己决定，比如可以直接在控制台输出“CD播放中”等等）。源程序：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication15 public interface ICDPlayer void Play(); void Stop(); void NextTrack(); void PreviousTrack(); int CurrentTrack get; public class CDPlayer:ICDPlayer private int currentTrack = 0; public int CurrentTrack get return currentTrack; public void Play() Console.WriteLine(开始播放歌曲); Console.WriteLine(CD.CurrentTrack=0,currentTrack); public void Stop() Console.WriteLine (停止播放歌曲) ; public void NextTrack() Console.WriteLine(下一歌曲); currentTrack+; Console.WriteLine(CD.CurrentTrack=0,currentTrack); public void PreviousTrack() Console.WriteLine(前一首歌曲); if (currentTrack = 1) currentTrack-; Console.WriteLine(CD.CurrentTrack=0, currentTrack); static void Main(string args) string selection; Console.WriteLine(该程序控制歌曲播放！); Console.WriteLine(1.开始播放歌曲!); Console.WriteLine(2.停止播放歌曲!); Console.WriteLine(3.下一歌曲!); Console.WriteLine(4.前一首歌曲!); CDPlayer CD=new CDPlayer(); do Console.WriteLine(请选择:); selection = Console.ReadLine(); switch (selection) case 1: CD.Play(); break; case 2: CD.Stop(); break; case 3: CD.NextTrack(); break; case 4: CD.PreviousTrack(); break; while (selection !=2); Console.ReadKey(); 运行结果：实验4 事件的实现实验要求：参照课本例9.7的综合示例，实现事件处理。源程序：using System;using System.Collections;using System.Text;namespace ConsoleApplication14 public class NameListEventArgs : EventArgs private string name; public string Name get return ; set = value; private int count; public int Count get return this.count; set this.count = value; public NameListEventArgs(string name, int count) Name = name; Count = count; public delegate void NameListEventHandler(object source, NameListEventArgs args); public class NameList ArrayList list; public event NameListEventHandler nameListEvent; public NameList() list = new ArrayList(); public void Add(string Name) list.Add(Name); if (nameListEvent != null) nameListEvent(this, new NameListEventArgs(Name, list.Count); public class EventDemo public static void Method1(object source, NameListEventArgs args) Console.WriteLine(列表中增加了项目:0, args.Name); public static void Method2(object source, NameListEventArgs args) Console.WriteLine(列表中的项目数:0, args.Count); public static void Main() NameList n1 = new NameList(); ListEvent += new NameListEventHandler(EventDemo.Method1); ListEvent += new NameListEventHandler(EventDemo.Method2); n1.Add(张三