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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