プログラミング学習の記録 345.1 "初めてのC# 第2版"の第14章(ジェネリックとコレクション)の練習問題2

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』(Jesse Liberty+Brian MacDonald著、日向俊二訳、オライリー・ジャパン、2006年、ISBN978-487311-294-7)の第14章(ジェネリックとコレクション)の14.6(練習問題)の練習14-2を解いてみる。

練習 14-2

using System; using System.Collections.Generic; abstract class Animal : IComparable<Animal> { private int weight; private string name; public Animal(int weight, string name) { this.weight = weight; this.name = name; } abstract public void Speak(); abstract public void Move(); public override string ToString() { return "Weight: " + this.weight + " Name: " + this.name; } public int CompareTo(Animal rhs) { return this.weight.CompareTo(rhs.weight); } } class Cat:Animal { public Cat(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("みゃーみゃー"); } public override void Move() { Console.WriteLine("スルスル"); } public override string ToString() { return "Cat " + base.ToString(); } } class Dog : Animal { public Dog(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("わんわん"); } public override void Move() { Console.WriteLine("てくてく"); } public override string ToString() { return "Dog " + base.ToString(); } } class Tester { public void Run() { Cat tama = new Cat(10, "Tama"); Dog pochi = new Dog(20, "Pochi"); Cat sora = new Cat(5, "Sora"); Dog milo = new Dog(15, "Milo"); List<Animal> animals = new List<Animal>(); animals.Add(tama); animals.Add(pochi); animals.Add(sora); animals.Add(milo); Console.WriteLine("動物のリスト"); foreach (Animal animal in animals) { Console.WriteLine(animal.ToString()); } animals.Sort(); Console.WriteLine("\n重さでソート後"); foreach (Animal animal in animals) { Console.WriteLine(animal.ToString()); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

動物のリスト Cat Weight: 10 Name: Tama Dog Weight: 20 Name: Pochi Cat Weight: 5 Name: Sora Dog Weight: 15 Name: Milo 重さでソート後 Cat Weight: 5 Name: Sora Cat Weight: 10 Name: Tama Dog Weight: 15 Name: Milo Dog Weight: 20 Name: Pochi 続行するには何かキーを押してください . . .