プログラミング学習の記録 316 "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14.6(練習問題)の14-3, 4

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14章(ジェネリックとコレクション))の14.6(練習問題)の14-3, 4を解いてみる。

練習 14-3

Stack

using System; using System.Collections.Generic; abstract public class 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 base.ToString(); } } public 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 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("テクテク"); } } class Tester { public void Run() { Dog pochi = new Dog(10, "Pochi"); Cat tama = new Cat(20, "Tama"); Stack<Animal> animals = new Stack<Animal>(); animals.Push(pochi); animals.Push(tama); foreach (Animal animal in animals) { Console.WriteLine(animal); animal.Speak(); animal.Move(); Console.WriteLine(); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Cat みゃーみゃー スルスル Dog わんわん テクテク 続行するには何かキーを押してください . . .

Queue

using System; using System.Collections.Generic; abstract public class 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 base.ToString(); } } public 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 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("テクテク"); } } class Tester { public void Run() { Dog pochi = new Dog(10, "Pochi"); Cat tama = new Cat(20, "Tama"); Queue<Animal> animals = new Queue<Animal>(); animals.Enqueue(pochi); animals.Enqueue(tama); foreach (Animal animal in animals) { Console.WriteLine(animal); animal.Speak(); animal.Move(); Console.WriteLine(); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Dog わんわん テクテク Cat みゃーみゃー スルスル 続行するには何かキーを押してください . . .

 

練習 14-4

using System; using System.Collections.Generic; abstract public class Animal : IComparable<Animal> { private int weight; private string name; public Animal(int weight) { this.weight = weight; } public Animal(int weight, string name) { this.weight = weight; this.name = name; } public override string ToString() { return "Weight:" + this.weight + " Name: " + this.name; } public static AnimalCoparer GetComparer() { return new Animal.AnimalCoparer(); } public int CompareTo(Animal rhs) { return this.weight.CompareTo(rhs.weight); } public int CompareTo(Animal rhs, Animal.AnimalCoparer.ComparisonType which) { switch (which) { case Animal.AnimalCoparer.ComparisonType.Weight: return this.weight.CompareTo(rhs.weight); case Animal.AnimalCoparer.ComparisonType.Name: return this.name.CompareTo(rhs.name); } return 0; } public class AnimalCoparer : IComparer<Animal> { private Animal.AnimalCoparer.ComparisonType whichComparison; public enum ComparisonType { Weight, Name, }; public int Compare(Animal lhs, Animal rhs) { return lhs.CompareTo(rhs, WhichComparison); } public Animal.AnimalCoparer.ComparisonType WhichComparison { get { return whichComparison; } set { whichComparison = value; } } } } public class Cat : Animal { public Cat(int weight, string name) : base(weight, name) { } } public class Dog : Animal { public Dog(int weight, string name) : base(weight, name) { } } class Tester { public void Run() { Dog pochi = new Dog(10, "Pochi"); Dog milo = new Dog(30, "Milo"); Cat tama = new Cat(20, "Tama"); Cat sora = new Cat(15, "Sora"); List<Animal> animals = new List<Animal>(); animals.Add(pochi); animals.Add(milo); animals.Add(tama); animals.Add(sora); Console.WriteLine("ソート前"); foreach (Animal animal in animals) { Console.WriteLine(animal); } Animal.AnimalCoparer c = Animal.GetComparer(); c.WhichComparison = Animal.AnimalCoparer.ComparisonType.Weight; animals.Sort(c); Console.WriteLine("\nWeightでソート後"); foreach (Animal animal in animals) { Console.WriteLine(animal); } c.WhichComparison = Animal.AnimalCoparer.ComparisonType.Name; animals.Sort(c); Console.WriteLine("\nNameでソート後"); foreach (Animal animal in animals) { Console.WriteLine(animal); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

ソート前 Weight:10 Name: Pochi Weight:30 Name: Milo Weight:20 Name: Tama Weight:15 Name: Sora Weightでソート後 Weight:10 Name: Pochi Weight:15 Name: Sora Weight:20 Name: Tama Weight:30 Name: Milo Nameでソート後 Weight:30 Name: Milo Weight:10 Name: Pochi Weight:15 Name: Sora Weight:20 Name: Tama 続行するには何かキーを押してください . . .