脚本宝典收集整理的这篇文章主要介绍了关于继承和多态性的实例代码，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。本人学Asp.Net不久，用的是C#写代码，在学习C#中发现很多初学者对继承和多态性不是特别的了解，因此作了这个例子，希望对您有所帮助，例子很简单
<%@ Page Language="C#" ContentTyPE="text/htML" ResponseEncoding="gb2312" Src="profile2.cs" %> <%@ Import namespace="shai" %> <html> <head> <style> p{font:Arial, Helvetica, sans-serif; background-color :#cccccc; border-color :black; border-width :1; border-style :solid; padding:10,10,10,10; } </style> <script language="c#" runat="server"> public void Page_Load(Object sender,Eventargs e) { Profile profile = new Profile(); message.InnerHtml += "<u>Profile Class</u><br>"; message.InnerHtml += "Firstname:"+profile.getFirstname()+"<br>"; message.InnerHtml += "Lastname:"+profile.getLastname()+"<br>"; message.InnerHtml += "Phone:"+profile.getPhonenumber()+"<br><br>"; profile.save(); ExtendedProfile extendedprofile = new ExtendedProfile(); message.InnerHtml += "<u>ExtendedProfile Class</u></br>"; message.InnerHtml += "Firstname:"+profile.getFirstname()+"<br>"; message.InnerHtml += "Lastname:"+profile.getLastname()+"<br>"; message.InnerHtml += "Phone:"+extendedprofile.getPhonenumber()+"<br>"; message.InnerHtml += "Address1:"+extendedprofile.getAddress1()+"<br>"; message.InnerHtml += "Address2:"+extendedprofile.getAddress2()+"<br>"; message.InnerHtml += "CITy:"+extendedprofile.getCity()+"<br>"; message.InnerHtml += "state:"+extendedprofile.getState()+"<br>"; message.InnerHtml += "Postal:"+extendedprofile.getPostal()+"<br>"; message.InnerHtml += "Description:"+extendedprofile.getDescription()+"<br>"; extendedprofile.save(); } </script> <;meta http-equiv="Content-type" content="text/html; charset=gb2312"> <title></title> </head> <body style="font:Arial, Helvetica, sans-serif "> <b><h3>简单的继承/多态例子</h3></b><br><br> object output:<br> <br> <p id="message" runat="server" /> </body> </html> 类定义文件profile2.cs using System; using System.IO; using System.XMl; namespace shai //名称空间shai { interface ISaveData //定义一个接口ISaveData，他作为Profile的基类被继承，由于其有多态性的特点，可以被 { //不同类调用其中的方法，并修改 void save(); } public class Profile:ISaveData //定义类Profile { protected string _firstname; //里面包含三个属性，分别为_firstname、_lastname、phonenumber protected string _lastname; protected string _phonenumber; public Profile() //为属性定义其中的初始值 { _firstname = "Saidy"; _lastname = "Chen"; _phonenumber = "(010)88716990"; } public string getPhonenumber() //Profile类中的方法getPhonenumber() { return _phonenumber; } public virtual void setPhonenumber(string phonenumber) { _phonenumber = phonenumber; } public string getFirstname() //Profile类中的方法getFirstname() { return _firstname; } public void setFirstname(string firstname) { _firstname = firstname; } public string getLastname() //Profile类中的方法getLastname() { return _lastname; } public void setLastname(string lastname) { _lastname = lastname; } public virtual void save() //调用ISaveData接口的save()方法 { //保存数据为Text格式 FileStream fs = new FileStream("D:\\myweb2\\profile2.txt",FileMode.Create,FileAccess.Write); StreamWriter sw = new StreamWriter(fs); sw.WriteLine("Firstname:"+_firstname.ToString()); sw.WriteLine("Lastname:"+_lastname.ToString()); sw.WriteLine("Phone:"+_phonenumber.ToString()); sw.Flush(); sw.Close(); fs.Close(); } } public class ExtendedProfile:Profile 建立Profile子类ExtendedProfile，他可以继承Profile中的方法 { protected string _address1; //子类ExtendedProfile的属性 protected string _address2; protected string _city; protected string _state; protected string _postal; protected string _description; public ExtendedProfile() //子类ExtendedProfile中属性的初始值 { _address1 = "清华大学"; _address2 = "清华大学物理实验室"; _city = "北京"; _state = "北京"; _postal = "100024"; _description = "教授"; } public override void setPhonenumber(string phonenumber) //继承类Profile中的setPhonenumber()方法 { //setPhonenumber()方法的重载 _phonenumber = phonenumber; } public string getAddress1() //子类ExtendedProfile中的方法getAddress1()，以下类推 { return _address1; } public string getAddress2() { return _address2; } public void setAddress(string address1,string address2) { _address1 = address1; _address2 = address2; } public string getCity() { return _city; } public void setCity(string city) { _city = city; } public string getState() { return _state; } public void setState(string state) { _state = state; } public string getPostal() { return _postal; } public void setPostal(string postal) { _postal = postal; } public string getDescription() { return _description; } public void setDescription(string description) { _description = description; } public override void save() //调用接口ISaveData()中的方法save()，save()方法的重载，由于多态性 { //子类ExtendedProfile可以自定义并修改save()方法 string _document = "d:\\myweb2\\saidy.xml"; XmlTextWriter writer = null; //保存为一个Xml文件 try { writer = new XmlTextWriter(_document,null); writer.Formatting = Formatting.Indented; writer.WriteStartDocument(false); writer.WriteDocType("Profile",null,null,null); //表示<!DOCTYPE Profile> writer.WriteStartElement("Profile"); //生成根元素 writer.WriteElementString("firstname",_firstname); //生成子元素 <firstname>_firstname</firstname> writer.WriteElementString("lastname",_lastname); writer.WriteElementString("phonenumber",_phonenumber); writer.WriteElementString("address1",_address1); writer.WriteElementString("address2",_address2); writer.WriteElementString("city",_city); writer.WriteElementString("state",_state); writer.WriteElementString("postal",_postal); writer.WriteEndElement(); writer.Flush(); writer.Close(); } catch(Exception ee) { Console.WriteLine("Exception:{0}",ee.ToString()); } } } }
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