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;
}
#region IComparable
public int CompareTo(Animal obj)
{
return this.weight.CompareTo(obj.weight);
}
#endregion IComparable
public bool Equals(Animal obj)
{
if (this.weight == obj.weight)
{
return true;
}
return false;
}
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 static AnimalComparer GetComparer()
{
return new Animal.AnimalComparer();
}
public class AnimalComparer : IComparer<Animal>
{
public enum ComparisonType
{
Weight, Name,
};
private Animal.AnimalComparer.ComparisonType which;
public bool Equals(Animal lhs, Animal rhs)
{
return this.Compare(lhs, rhs) == 0;
}
public int Compare(Animal x, Animal y)
{
return x.CompareTo(y, WhichComparison);
}
public Animal.AnimalComparer.ComparisonType WhichComparison
{
get { return which; }
set { which = value; }
}
}
}
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("てくてく");
}
}
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("するする");
}
}
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 = 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);
Display(animalList);
Console.WriteLine("名前でソート");
c.WhichComparison = Animal.AnimalComparer.ComparisonType.Name;
animalList.Sort(c);
Display(animalList);
}
static void Main()
{
Tester t = new Tester();
t.Run();
}
}
入出力結果(Console Window)
重さでソート Tama, 5 Pochi, 10 Sora, 15 Taro, 20 名前でソート Pochi, 10 Sora, 15 Tama, 5 Taro, 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(BBEdit)
$('#pre0').text("");
function Animal(weight, name){
var weight = weight;
var name = name;
this.toString = function(){
return name + ", " + weight;
};
this.get_weight = function(){
return weight;
};
this.get_name = function(){
return name;
};
}
Animal.prototype.speak = function( ) {
throw "抽象メソッドspeakが定義されていません";
};
Animal.prototype.move = function(){
throw "抽象メソッドmoveが定義されていません";
};
function Cat() {
Animal.apply(this, arguments);
}
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");
};
function Dog() {
Animal.apply(this, arguments);
}
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");
};
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];
var result = "重さでソート\n";
animals.sort(function(a, b){
return a.get_weight() - b.get_weight();
});
for(var i = 0; i < animals.length; i++){
result += animals[i] + "\n";
}
result += "名前でソート\n";
animals.sort(function(a, b){
if(a.get_name() < b.get_name()){
return -1;
} else if(a.get_name() > b.get_name()){
return 1;
} else {
return 0;
}
});
for(var i = 0; i < animals.length; i++){
result += animals[i] + "\n";
}
$('#pre0').text(result);
pythonの場合。
sample.py
コード(BBEdit)
#!/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ない")
def move(self):
raise Exception("moveメソッドが定義されていない")
def __str__(self):
return "{0}, {1}".format(self._name, self._weight)
def get_weight(self):
return self._weight
def get_name(self):
return self._name
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")
def display(animals):
for animal in animals:
print(animal)
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("重さでソート")
animals.sort(key=lambda x: x.get_weight())
display(animals)
print("名前でソート")
animals.sort(key=lambda x: x.get_name())
display(animals)
入出力結果(Terminal)
$ ./sample.py 重さでソート Tama, 5 Pochi, 10 Sora, 15 Taro, 20 名前でソート Pochi, 10 Sora, 15 Tama, 5 Taro, 20 $
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