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、ISBN978-487311-294-7)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;
}
public abstract void Speal();
public abstract void Move();
public override string ToString()
{
return "Name:" + name + " Weight:" + weight;
}
public bool Equals(Animal other)
{
if (this.weight == other.weight)
{
return true;
}
return false;
}
#region IComprable
public static AnimalComparer GetComparer()
{
return new Animal.AnimalComparer();
}
public int CompareTo(Animal obj)
{
return this.weight.CompareTo(obj.weight);
}
#endregion
public int CompareTo(Animal obj,
Animal.AnimalComparer.ComparionType which)
{
switch (which)
{
case AnimalComparer.ComparionType.Weight:
return this.weight.CompareTo(obj.weight);
case AnimalComparer.ComparionType.Name:
return this.name.CompareTo(obj.name);
default: return 0;
}
}
public class AnimalComparer : IComparer<Animal>
{
public enum ComparionType
{
Weight, Name,
};
private Animal.AnimalComparer.ComparionType which;
public Animal.AnimalComparer.ComparionType Which
{
get { return which; }
set { which = value; }
}
public bool Equals(Animal lhs, Animal rhs)
{
return this.Compare(lhs, rhs) == 0;
}
public int Compare(Animal lhs, Animal rhs)
{
return lhs.CompareTo(rhs, Which);
}
}
}
class Cat : Animal
{
public Cat(int weight, string name) :
base(weight, name) { }
public override void Speal()
{
Console.WriteLine("ニャーニャー");
}
public override void Move()
{
Console.WriteLine("するする");
}
}
class Dog : Animal
{
public Dog(int weight, string name) :
base(weight, name) { }
public override void Speal()
{
Console.WriteLine("ワンワン");
}
public override void Move()
{
Console.WriteLine("てくてく");
}
}
class Tester
{
public void Display(List<Animal> animalList)
{
foreach (Animal animal in animalList)
{
Console.WriteLine(animal);
}
}
public void Run()
{
Cat tama = new Cat(5, "Tama");
Cat sora = new Cat(15, "Sora");
Dog pochi = new Dog(10, "Pochi");
Dog taro = new Dog(20, "Taro");
Animal[] animals = { tama, sora, pochi, taro };
List<Animal> animalList = new List<Animal>();
Animal.AnimalComparer c = new Animal.AnimalComparer();
foreach (Animal animal in animals)
{
animalList.Add(animal);
}
Console.WriteLine("動物のリスト");
Display(animalList);
Console.WriteLine("Nameでソート");
c.Which =
Animal.AnimalComparer.ComparionType.Name;
animalList.Sort(c);
Display(animalList);
Console.WriteLine("Weightでソート");
c.Which = Animal.AnimalComparer.ComparionType.Weight;
animalList.Sort(c);
Display(animalList);
}
static void Main()
{
Tester t = new Tester();
t.Run();
}
}
入出力結果(Console Window)
動物のリスト Name:Tama Weight:5 Name:Sora Weight:15 Name:Pochi Weight:10 Name:Taro Weight:20 Nameでソート Name:Pochi Weight:10 Name:Sora Weight:15 Name:Tama Weight:5 Name:Taro Weight:20 Weightでソート Name:Tama Weight:5 Name:Pochi Weight:10 Name:Sora Weight:15 Name:Taro Weight:20 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(TextWrangler)
var Animal = function(weight, name){
var weight = weight;
var name = name;
this.get_weight = function(){
return weight;
};
this.get_name = function(){
return name;
};
};
Animal.prototype.speak = function(){
throw "speakメソッドが定義されていません。";
};
Animal.prototype.move = function(){
throw "moveメソッドが定義されていません。";
};
Animal.prototype.toString = function(){
return "Name:" + this.get_name() + " Weight:" + this.get_weight();
};
var Cat = function(weight, name){
Animal.apply(this, [weight, name]);
};
Cat.prototype = new Animal;
Cat.constructor = Cat;
Cat.prototype.speak = function(){
$('#pre0').append("ニャーニャー\n");
};
Cat.prototype.move = function(){
$('#pre0').append("するする\n");
};
var Dog = function(weight, name){
Animal.apply(this, [weight, name]);
};
Dog.prototype = new Animal;
Dog.prototype.constructor = Dog;
Dog.prototype.speak = function(){
$('#pre0').append("ワンワン\n");
};
Dog.prototype.move = function(){
$('#pre0').append("てくてく");
};
Array.prototype.display = function(){
for(var i = 0; i < this.length; i++){
$('#pre0').append(this[i] + "\n");
}
};
var tama = new Cat(5, "Tama");
var sora = new Cat(15, "Sora");
var pochi = new Dog(10, "Pochi");
var taro = new Dog(20, "Taro");
var animals = [tama, sora, pochi, taro];
$('#pre0').append("動物の配列)\n");
animals.display();
$('#pre0').append("Nameでソート\n");
animals.sort(function(a, b){
if(a.get_name() === b.get_name ){
return 0;
} else if(a.get_name() < b.get_name()){
return -1;
} else {
return 1;
}
});
animals.display();
$('#pre0').append("Weightでソート\n");
animals.sort(function(a, b){
return a.get_weight() < b.get_weight();
});
animals.display();
pythonの場合。
sample.py
コード(TextWrangler)
#!/usr/bin/env python3.3
# -*- coding: utf-8 -*-
class Animal:
def __init__(self, weight, name):
self.weight = weight
self.name = name
def speak(self):
raise Exception("speakメソッドが定義されていません。")
def move(self):
raise Exception("moveメソッドが定義されていません。")
def __str__(self):
return "Name:{0} Weight:{1}".format(self.name, self.weight)
def __repr__(self):
return "Name:{0} Weight:{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")
if __name__ == '__main__':
tama = Cat(5, "Tama")
sora = Cat(15, "Sora")
pochi = Dog(10, "Pochi")
taro = Dog(20, "Taro")
animals = [tama, sora, pochi, taro]
print("動物のリスト")
for animal in animals:
print(animal)
import operator
print("Nameでソート")
animals.sort(key=operator.attrgetter("name"))
for animal in animals:
print(animal)
print("Weightでソート")
animals.sort(key=operator.attrgetter("weight"))
for animal in animals:
print(animal)
入出力結果(Terminal)
$ ./sample.py 動物のリスト Name:Tama Weight:5 Name:Sora Weight:15 Name:Pochi Weight:10 Name:Taro Weight:20 Nameでソート Name:Pochi Weight:10 Name:Sora Weight:15 Name:Tama Weight:5 Name:Taro Weight:20 Weightでソート Name:Tama Weight:5 Name:Pochi Weight:10 Name:Sora Weight:15 Name:Taro Weight:20 $
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