プログラミング学習の記録 310.1 "初めてのC# 第2版"の第11章(継承とポリモーフィズム)の11.9(練習問題)

開発環境

• Microsoft Windows 7 Home Premium (OS)
• Microsoft Visual C# 2010 Express Edition (IDE)
• 言語: C#

"初めてのC# 第2版"の第11章(継承とポリモーフィズム)の11.9(練習問題)を解いてみる。

練習 11-1

using System; public class Telephone { protected string phonetype; public void Ring() { Console.WriteLine("Ringing the {0}", phonetype); } } public class ElectronicPhone : Telephone { public ElectronicPhone() { this.phonetype = "Degital"; } } class Tester { public void Run() { ElectronicPhone phone = new ElectronicPhone(); phone.Ring(); } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Ringing the Degital 続行するには何かキーを押してください . . .

 

練習 11-2

using System; public class Telephone { protected string phonetype; public virtual void Ring() { Console.WriteLine("Ringing the {0}", phonetype); } } public class ElectronicPhone : Telephone { public ElectronicPhone() { this.phonetype = "Degital"; } public override void Ring() { Console.WriteLine("Ringing the {0}. Pipipi, Pipipi.", phonetype); } } class Tester { public void Run() { ElectronicPhone phone = new ElectronicPhone(); phone.Ring(); } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Ringing the Degital. Pipipi, Pipipi. 続行するには何かキーを押してください . . .

 

練習 11-3

using System; public abstract class Telephone { protected string phonetype; public abstract void Ring(); } public class ElectronicPhone : Telephone { public ElectronicPhone() { this.phonetype = "Degital"; } public override void Ring() { Console.WriteLine("Ringing the {0}. Pipipi, Pipipi.", phonetype); } } public class TalkingPhone : Telephone { public TalkingPhone() { this.phonetype = "Talking"; } public override void Ring() { Console.WriteLine("Ringing the {0}. Hi!", phonetype); } } class Tester { public void Run() { ElectronicPhone ep = new ElectronicPhone(); TalkingPhone tp = new TalkingPhone(); ep.Ring(); tp.Ring(); } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Ringing the Degital. Pipipi, Pipipi. Ringing the Talking. Hi! 続行するには何かキーを押してください . . .