開発環境
- Microsoft Windows 8 Pro 64bit 日本語 (OS)
- Microsoft Visual Studio Express 2012 for Windows Desktop (IDE)
- プログラミング言語: 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、ISBN978-487312-194-7)の 第14章(ジェネリックとコレクション)14.6(練習問題)練習14-4.を解いてみる。
その他参考書籍
練習14-4.
コード
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 name + ", " + weight; } public bool Equals(Animal other) { if (this.weight == other.weight) { return true; } return false; } public static AnimalComparer GetComparer() { return new Animal.AnimalComparer(); } public int CompareTo(Animal other) { return this.weight.CompareTo(other.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); default: return 0; } } public class AnimalComparer : IComparer<Animal> { public enum ComparisonType { Weight, Name, }; private Animal.AnimalComparer.ComparisonType whichComparison; public bool Equals(Animal x, Animal y) { return this.Compare(x, y) == 0; } public int Compare(Animal x, Animal y) { return x.CompareTo(y, WhichComparison); } public Animal.AnimalComparer.ComparisonType WhichComparison { get { return whichComparison; } set { whichComparison = value; } } } } class Dog : Animal { public Dog(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("ワンワン"); } public override void Move() { Console.WriteLine("てくてく"); } } class Cat : Animal { public Cat(int weight, string name) : base(weight, name) { } public override void Speak() { Console.WriteLine("ニャーニャー"); } public override void Move() { Console.WriteLine("するする"); } } class Tester { public void Run() { Cat tama = new Cat(5, "Tama"); Cat sora = new Cat(15, "Sora"); Dog frisky = new Dog(10, "Frisky"); Dog laika = new Dog(20, "Laika"); Animal[] animals = { tama, sora, frisky, laika }; List<Animal> animalList = new List<Animal>(); Animal.AnimalComparer c = Animal.GetComparer(); foreach (Animal animal in animals) { animalList.Add(animal); } Console.WriteLine("重さでソート"); c.WhichComparison = Animal.AnimalComparer.ComparisonType.Weight; animalList.Sort(c); foreach (Animal animal in animalList) { Console.WriteLine(animal); } Console.WriteLine("アルファベット順にソート"); c.WhichComparison = Animal.AnimalComparer.ComparisonType.Name; animalList.Sort(c); foreach (Animal animal in animalList) { Console.WriteLine(animal); } } static void Main() { Tester t = new Tester(); t.Run(); } }
入出力結果(Console Window)
重さでソート Tama, 5 Frisky, 10 Sora, 15 Laika, 20 アルファベット順にソート Frisky, 10 Laika, 20 Sora, 15 Tama, 5 続行するには何かキーを押してください . . .
ちなみにJavaScriptの場合。
コード(BBEdit)
var Animal = function (weight, name) { var weight = weight name = name; this.getWeight = function () { return weight; }, this.getName = function ( ) { return name; }; }, Cat = function ( ) { Animal.apply(this, arguments); }, Dog = function ( ) { Animal.apply(this, arguments); }, animals = [], animalStack = [], animalQueue = [], tama, sora, frisky, laika, i, max; Animal.prototype.speak = function () { $('#pre0').append( "抽象speak\n" ); }, Animal.prototype.move = function ( ) { $('#pre0').append( "抽象move\n" ); }, Animal.prototype.toString = function( ) { return this.getName() +", " + this.getWeight(); }, Cat.prototype = new Animal(), Cat.prototype.speak = function ( ) { $('#pre0').append("ニャーニャー\n"); }, Cat.prototype.move = function ( ) { $('#pre0').append("するする\n"); }, Dog.prototype = new Animal(), Dog.prototype.speak = function ( ) { $('#pre0').append("ワンワン\n"); }, Dog.prototype.move = function ( ) { $('#pre0').append("てくてく\n"); }, tama = new Cat(5, "Tama"), sora = new Cat(15, "Sora"), frisky = new Dog(10, "Frisky"), laika = new Dog(20, "Laika"), animals = [tama, sora, frisky, laika]; $('#pre0').append("重さでソート\n"); animals.sort(function ( x, y ) { return x.getWeight() - y.getWeight(); }); for (i = 0, max = animals.length; i < max; i += 1) { $('#pre0').append(animals[i] + "\n"); } $('#pre0').append("名前でソート\n") animals.sort(function ( x,y ) { if( x.getName() < y.getName() ) { return -1; } else if(x.getName() > y.getName() ) { return 1; } else { return 0; } }); for (i = 0, max = animals.length; i < max; i += 1) { $('#pre0').append(animals[i] + "\n"); }
pythonの場合。
コード(BBEdit)
sample.py
#!/usr/bin/env python3.3 #-*- coding: utf-8 -*- class Animal: def __init__(self, weight, name): self._weight = weight self._name = name def getWeight(self): return self._weight def getName(self): return self._name def speak(self): raise Exception("Animal speak") def move(self): raise Exception("Animal move") def __str__(self): return "{0}, {1}".format(self._name, self._weight) class Cat(Animal): def speak(self): print("ニャーニャー") def move(self): print("するする") class Dog(Animal): def speak(self): print("ワンワン") def move(self): print("てくてく") tama = Cat(5, "Tama") sora = Cat(15, "Sora") frisky = Dog(10, "Frisky") laika = Dog(20, "Laika") animals = [tama, sora, frisky, laika] print("重さでソート") animals.sort(key=lambda x:x.getWeight()) for animal in animals: print(animal) print("アルファベット順でソート") animals.sort(key=lambda x:x.getName()) for animal in animals: print(animal)
入出力結果(Terminal)
$ ./sample.py 重さでソート Tama, 5 Frisky, 10 Sora, 15 Laika, 20 アルファベット順でソート Frisky, 10 Laika, 20 Sora, 15 Tama, 5 $
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