プログラミング学習の記録 277.1 "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14.6(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p.276, 第14章(ジェネリックとコレクション)の14.6(練習問題)、練習 14-1, 2, 3, 4を解いてみる。

練習 14-1

using System;

abstract public class Animal
{
    protected int weight;
    protected string name;

public Animal(int weight, string name)
    {
        this.weight = weight;
        this.name = name;
    }

abstract public void Speak();
    abstract public void Move();
    abstract public override string ToString();
}

public class Cat : Animal
{
    public Cat(int weight, string name) :
        base(weight, name)
    { }
    public override void Speak()
    {
        Console.WriteLine("にゃおー");
    }

public override void Move()
    {
        Console.WriteLine("するするっ");
    }

public override string ToString()
    {
        return "Cat Name: " + this.name
            + "Weight: " + this.weight;
    }
}

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("てくてく");
    }

public override string ToString()
    {
        return "Dog Name: " + this.name
            + " Weight: " + this.weight;
    }
}

public class Tester
{
    public void Run()
    {
        Animal[] animals = new Animal[3];
        animals[0] = new Dog(10, "Pochi");
        animals[1] = new Cat(20, "Tama");
        animals[2] = new Dog(30, "Taro");

foreach (Animal a in animals)
        {
            a.Speak();
            a.Move();
            Console.WriteLine(a.ToString());
        }
    }

static void Main()
    {
        Tester t = new Tester();
        t.Run();
    }
}

出力結果

わんわんてくてく Dog Name: Pochi Weight: 10 にゃおーするするっ Cat Name: TamaWeight: 20 わんわんてくてく Dog Name: Taro Weight: 30 続行するには何かキーを押してください . . .

練習 14-2

using System; using System.Collections.Generic; abstract public class Animal:IComparable { protected int weight; protected string name; public Animal(int weight, string name) { this.weight = weight; this.name = name; } abstract public void Speak(); abstract public void Move(); abstract public override string ToString(); public int CompareTo(Object rhs) { Animal animal = rhs as Animal; if (animal != null) { return this.weight.CompareTo(animal.weight); } else { throw null; } } } public class Cat : Animal { public Cat(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("にゃおー"); } public override void Move() { Console.WriteLine("するするっ"); } public override string ToString() { return "Cat Name: " + this.name + "Weight: " + this.weight; } } 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("てくてく"); } public override string ToString() { return "Dog Name: " + this.name + " Weight: " + this.weight; } } public class Tester { public void Run() { List<Animal> animals = new List<Animal>(); animals.Add(new Cat(20, "Tama")); animals.Add(new Dog(10, "Pochi")); animals.Add(new Dog(30, "Taro")); Console.WriteLine("ソート前"); foreach (Animal a in animals) { a.Speak(); a.Move(); Console.WriteLine(a.ToString()); } Console.WriteLine(); Console.WriteLine("ソート後"); animals.Sort(); foreach (Animal a in animals) { Console.WriteLine(a.ToString()); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

ソート前にゃおーするするっ Cat Name: TamaWeight: 20 わんわんてくてく Dog Name: Pochi Weight: 10 わんわんてくてく Dog Name: Taro Weight: 30 ソート後 Dog Name: Pochi Weight: 10 Cat Name: TamaWeight: 20 Dog Name: Taro Weight: 30 続行するには何かキーを押してください . . .

練習 14-3

using System; using System.Collections.Generic; abstract public class Animal:IComparable { protected int weight; protected string name; public Animal(int weight, string name) { this.weight = weight; this.name = name; } abstract public void Speak(); abstract public void Move(); abstract public override string ToString(); public int CompareTo(Object rhs) { Animal animal = rhs as Animal; if (animal != null) { return this.weight.CompareTo(animal.weight); } else { throw null; } } } public class Cat : Animal { public Cat(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("にゃおー"); } public override void Move() { Console.WriteLine("するするっ"); } public override string ToString() { return "Cat Name: " + this.name + "Weight: " + this.weight; } } 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("てくてく"); } public override string ToString() { return "Dog Name: " + this.name + " Weight: " + this.weight; } } public class Tester { public void Run() { Animal pochi = new Dog(10, "Pochi"); Animal tama = new Cat(20, "Tama"); Animal taro = new Dog(30, "Taro"); Stack<Animal> stack = new Stack<Animal>(); stack.Push(pochi); stack.Push(tama); stack.Push(taro); Queue<Animal> queue = new Queue<Animal>(); queue.Enqueue(pochi); queue.Enqueue(tama); queue.Enqueue(taro); Console.WriteLine("Collectionsに追加した順序\n" + pochi.ToString() + "\n" + tama.ToString() + "\n" + taro.ToString()); Console.WriteLine(); Console.WriteLine("Stackの場合"); foreach (Animal a in stack) { Console.WriteLine(a.ToString()); } Console.WriteLine(); Console.WriteLine("Queueの場合"); foreach (Animal a in queue) { Console.WriteLine(a.ToString()); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

Collectionsに追加した順序 Dog Name: Pochi Weight: 10 Cat Name: TamaWeight: 20 Dog Name: Taro Weight: 30 Stackの場合 Dog Name: Taro Weight: 30 Cat Name: TamaWeight: 20 Dog Name: Pochi Weight: 10 Queueの場合 Dog Name: Pochi Weight: 10 Cat Name: TamaWeight: 20 Dog Name: Taro Weight: 30 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 { protected int weight; protected string name; public Animal(int weight, string name) { this.weight = weight; this.name = name; } abstract public void Speak(); abstract public void Move(); abstract public override string ToString(); public static AnimalComparer GetComparer() { return new Animal.AnimalComparer(); } public int ComparerTo(Animal rhs) { return this.weight.CompareTo(rhs.weight); } public int CompareTo(Animal rhs, Animal.AnimalComparer.ComparisonType which) { switch (which) { case AnimalComparer.ComparisonType.Weight: return this.weight.CompareTo(rhs.weight); case AnimalComparer.ComparisonType.Name: return this.name.CompareTo(rhs.name); } return 0; } public class AnimalComparer : IComparer<Animal> { private Animal.AnimalComparer.ComparisonType whichComparison; public enum ComparisonType { Weight, Name, }; public bool Equels(Animal lhs, Animal rhs) { return this.Compare(lhs, rhs) == 0; } public int GetHashCode(Animal a) { return a.GetHashCode(); } public int Compare(Animal lhs, Animal rhs) { return lhs.CompareTo(rhs, whichComparison); } public Animal.AnimalComparer.ComparisonType WhichComparison { get { return whichComparison; } set { whichComparison = value; } } } } public class Cat : Animal { public Cat(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("にゃおー"); } public override void Move() { Console.WriteLine("するするっ"); } public override string ToString() { return "Cat Name: " + this.name + " Weight: " + this.weight; } } 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("てくてく"); } public override string ToString() { return "Dog Name: " + this.name + " Weight: " + this.weight; } } public class Tester { public void Run() { List<Animal> animals = new List<Animal>(); animals.Add(new Cat(20, "A")); animals.Add(new Dog(10, "B")); animals.Add(new Dog(30, "C")); Console.WriteLine("ソート前"); foreach (Animal a in animals) { a.Speak(); a.Move(); Console.WriteLine(a.ToString()); } Console.WriteLine(); Console.WriteLine("Wightでソート"); Animal.AnimalComparer cw = Animal.GetComparer(); cw.WhichComparison = Animal.AnimalComparer.ComparisonType.Weight; animals.Sort(cw); foreach (Animal a in animals) { Console.WriteLine(a.ToString()); } Console.WriteLine(); Console.WriteLine("Nameでソート"); Animal.AnimalComparer cn = Animal.GetComparer(); cn.WhichComparison = Animal.AnimalComparer.ComparisonType.Name; animals.Sort(cn); foreach (Animal a in animals) { Console.WriteLine(a.ToString()); } } static void Main() { Tester t = new Tester(); t.Run(); } }

出力結果

ソート前にゃおーするするっ Cat Name: A Weight: 20 わんわんてくてく Dog Name: B Weight: 10 わんわんてくてく Dog Name: C Weight: 30 Wightでソート Dog Name: B Weight: 10 Cat Name: A Weight: 20 Dog Name: C Weight: 30 Nameでソート Cat Name: A Weight: 20 Dog Name: B Weight: 10 Dog Name: C Weight: 30 続行するには何かキーを押してください . . .

コマンドプロンプトのコピー方法を知ったので出力結果も貼り付けることにしてみました。

Kamimura's blog

2010年8月10日火曜日

プログラミング学習の記録 277.1 "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14.6(練習問題)

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